CN116540310A - Geological detection system and method - Google Patents
Geological detection system and method Download PDFInfo
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Abstract
The present disclosure provides a geological exploration system and method, the system comprising a data acquisition instrument, a data processing terminal, a power supply electrode A, an infinity power supply electrode B and a plurality of measurement electrode pairs; the data acquisition instrument is used for setting power supply parameters of a power supply electrode system and acquiring a first potential difference, a second potential difference and a total field potential difference of each measuring electrode pair; the data processing terminal is used for determining apparent resistivity of the measuring electrode pair based on the first potential difference of the measuring electrode pair, determining apparent polarization rate of the measuring electrode pair based on the second potential difference and the total field potential difference of the measuring electrode pair, determining apparent charging rate of the measuring electrode pair based on the total field potential difference of the measuring electrode pair, imaging based on the apparent resistivity, the apparent polarization rate and the apparent charging rate of all the measuring electrode pairs, obtaining an equal apparent resistivity curve, an equal apparent polarization rate curve and an equal apparent charging rate curve, and predicting water content of the stratum in front of the palm face based on the equal apparent resistivity curve, the equal apparent polarization rate curve and the equal apparent charging rate curve.
Description
Technical Field
The present disclosure relates to the field of data processing, and more particularly to a geological exploration system and method.
Background
At present, the detection and prediction methods for the geology in front of the shield tunneling machine are mainly divided into two types. One is a horizontal advanced drilling method, which can only detect the periphery of a cutter head of a shield machine, so that the detection distance is short. The other is the technology of the laser diode method, which is limited by the distance between a power supply electrode and a measuring electrode by arranging the measuring electrode on the face, so that the detection distance is also short.
Disclosure of Invention
The present disclosure provides a geological exploration system and method.
According to a first aspect of the present disclosure, there is provided a geological exploration system comprising a supply electrode a and an infinitely distant supply electrode B, a measurement electrode system comprising a plurality of measurement electrode pairs, a data acquisition instrument and a data processing terminal;
the power supply electrode A is arranged on the side wall of the tunnel near the tunnel face, the infinity power supply electrode B is arranged on the side wall of the tunnel, which is a first preset length away from the tunnel face, the plurality of measuring electrode pairs are arranged on the side wall of the tunnel at intervals, one end of the data acquisition instrument is electrically connected with the power supply electrode system and each measuring electrode pair of the measuring electrode system, and the other end of the data acquisition instrument is electrically connected with the data processing terminal;
The data acquisition instrument is used for setting the power supply parameters of the power supply electrode system and acquiring a first potential difference, a second potential difference and a total field potential difference of each measuring electrode pair, wherein the first potential difference is the potential difference of the measuring electrode pair at the moment of power supply, and the second potential difference is the difference value of the total field potential difference and the first potential difference;
the data processing terminal is used for determining the apparent resistivity of the measuring electrode pair based on the first potential difference of the measuring electrode pair, determining the apparent polarization rate of the measuring electrode pair based on the second potential difference and the total field potential difference of the measuring electrode pair, determining the apparent charge rate of the measuring electrode pair based on the total field potential difference of the measuring electrode pair, imaging based on the apparent resistivity, the apparent polarization rate and the apparent charge rate of all measuring electrode pairs, obtaining an equal apparent resistivity curve, an equal apparent polarization rate curve and an equal apparent charge rate curve, and predicting the water content of the stratum in front of the palm face based on the equal apparent resistivity curve, the equal apparent polarization rate curve and the equal apparent charge rate curve.
Wherein the measuring electrode pair comprises a measuring electrode M and a measuring electrode N;
the data processing terminal is further used for determining a device coefficient based on the distance between the power supply electrode A and the measuring electrode M, the distance between the power supply electrode A and the measuring electrode N, the distance between the infinitely distant power supply electrode B and the measuring electrode M and the distance between the infinitely distant power supply electrode B and the measuring electrode N, multiplying the device coefficient by the first potential difference of the measuring electrode pair, dividing the first potential difference by the power supply current, and obtaining the apparent resistivity of the measuring electrode pair, wherein the power supply parameter comprises the power supply current.
The data processing terminal is further configured to divide the second potential difference of the measurement electrode pair by the total field potential difference of the measurement electrode pair to obtain the visual polarization rate of the measurement electrode pair.
The data processing terminal is further configured to obtain a potential difference curve of the measurement electrode pair, determine a constant integral from a first time point to a second time point in the potential difference curve, and divide the constant integral by the total field potential difference to obtain a apparent charging rate of the measurement electrode pair, where the first time point is a time point when power supply is stopped, and the second time point is a time point when the potential difference becomes zero after power supply is stopped.
The data acquisition instrument is also used for acquiring the first potential difference, the second potential difference and the total field potential difference of each measuring electrode pair for a plurality of times;
the data processing terminal is further used for determining multiple apparent resistivities, apparent polarizabilities and apparent chargeability of the measuring electrode pairs based on the first potential difference, the second potential difference and the total field potential difference of each measuring electrode pair acquired for multiple times, imaging the multiple apparent resistivities, the apparent polarizabilities and the apparent chargeability of all measuring electrode pairs based on the multiple apparent resistivities, the apparent polarizabilities and the apparent chargeability of all measuring electrode pairs to obtain multiple equal apparent resistivity curves, equal apparent polarizability curves and equal apparent chargeability curves, fitting the multiple equal apparent resistivity curves, the equal apparent polarizability curves and the equal apparent chargeability curves to obtain a target equal apparent resistivity curve, a target equal apparent polarizability curve and a target equal apparent chargeability curve, comparing the target equal apparent polarizability curves and the preset image, and predicting the water content of the stratum in front of the palm face.
According to a second aspect of the present disclosure, there is provided a geological exploration method applied to a geological exploration system including a power electrode a and an infinitely distant power electrode B, a measuring electrode system including a plurality of measuring electrode pairs, a data acquisition instrument, and a data processing terminal, the method comprising:
collecting a first potential difference, a second potential difference and a total field potential difference of each measuring electrode pair and obtaining a power supply parameter, wherein the first potential difference is a potential difference of the measuring electrode pair at a power supply moment, and the second potential difference is a difference value between the total field potential difference and the first potential difference;
determining a apparent resistivity of the measurement electrode pair based on the first potential difference of the measurement electrode pair, determining a apparent polarization rate of the measurement electrode pair based on the second potential difference and a total field potential difference of the measurement electrode pair, and determining a apparent charge rate of the measurement electrode pair based on the total field potential difference of the measurement electrode pair;
imaging based on the apparent resistivity, the apparent polarization rate and the apparent charging rate of all the measured electrode pairs to obtain an equal apparent resistivity curve, an equal apparent polarization rate curve and an equal apparent charging rate curve;
And predicting the water content of the stratum in front of the face based on the apparent resistivity curve, the apparent polarizability curve and the apparent charging rate curve.
Wherein the determining the apparent resistivity of the measurement electrode pair based on the first potential difference of the measurement electrode pair comprises:
acquiring a distance AM between a power supply electrode A and a measuring electrode M, a distance AN between the power supply electrode A and the measuring electrode N, a distance BM between AN infinitely distant power supply electrode B and the measuring electrode M and a distance BN between the infinitely distant power supply electrode B and the measuring electrode N;
determining a device coefficient based on the distance AM, the distance AN, the distance BM and the distance BN;
multiplying the device coefficient by the first potential difference of the measuring electrode pair, and dividing by the power supply current to obtain the apparent resistivity of the measuring electrode pair, wherein the power supply parameter comprises the power supply current.
Wherein the determining the visual polarization rate of the measuring electrode pair based on the second potential difference and the total field potential difference of the measuring electrode pair includes:
dividing the second potential difference of the measuring electrode pair by the total field potential difference of the measuring electrode pair to obtain the visual polarization rate of the measuring electrode pair.
Wherein said determining a apparent charge rate of said measurement electrode pair based on a total field potential difference of said measurement electrode pair comprises:
Acquiring a potential difference curve of the measuring electrode pair;
determining a fixed integral from a first time point to a second time point in the potential difference curve, wherein the first time point is a time point when power supply is stopped, and the second time point is a time point when the potential difference becomes zero after power supply is stopped;
dividing the fixed integral by the total field potential difference to obtain a apparent charge rate of the measurement electrode pair.
Wherein the method further comprises:
collecting the first potential difference, the second potential difference and the total field potential difference of each measuring electrode pair for a plurality of times;
determining a plurality of apparent resistivities, apparent polarizabilities, and apparent charge rates of each measurement electrode pair based on the first potential difference, the second potential difference, and the total field potential difference of the measurement electrode pair acquired a plurality of times;
imaging based on the plurality of apparent resistivity, apparent polarization rate and apparent charging rate of all the measuring electrode pairs to obtain a plurality of equal apparent resistivity curves, equal apparent polarization rate curves and equal apparent charging rate curves;
fitting the plurality of isoview resistivity curves, the isoview polarization rate curves and the isoview charging rate curves respectively to obtain a target isoview resistivity curve, a target isoview polarization rate curve and a target isoview charging rate curve;
And comparing the target equivalent apparent resistivity curve, the target equivalent apparent polarizability curve and the target equivalent apparent charging rate curve with preset images, and predicting the water content of the stratum in front of the tunnel face.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the disclosure, nor is it intended to be used to limit the scope of the disclosure. Other features of the present disclosure will become apparent from the following specification.
Drawings
The above, as well as additional purposes, features, and advantages of exemplary embodiments of the present disclosure will become readily apparent from the following detailed description when read in conjunction with the accompanying drawings. Several embodiments of the present disclosure are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings, in which:
in the drawings, the same or corresponding reference numerals indicate the same or corresponding parts.
FIG. 1 illustrates a schematic diagram of a geological exploration system provided by an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a potential difference curve of a measurement electrode pair according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a software electrode according to an embodiment of the present disclosure;
FIG. 4 shows a schematic flow chart of an implementation of a geological exploration method provided by an embodiment of the present disclosure;
FIG. 5 shows a schematic flow chart of an implementation of a geological exploration method provided by an embodiment of the present disclosure;
FIG. 6 shows a schematic flow chart of an implementation of a geological exploration method provided by an embodiment of the present disclosure;
FIG. 7 shows a schematic flow chart of an implementation of a geological exploration method provided by an embodiment of the present disclosure;
fig. 8 shows a schematic diagram of a composition structure of an electronic device according to an embodiment of the present disclosure.
Reference numerals:
1. cutter head of shield machine; 2. a support ring; 3. a tunnel sidewall; 4. a data processing terminal; 5. a data acquisition instrument; 6. an infinitely distant power supply electrode B; 7. a power supply electrode A; 8. a measuring electrode pair; 71. a soft bag; 72. bare copper wire; 73. positioning the mounting rod; 74. a signal transmission line; 75. a water absorbing body; 76. metal salt crystals; 77. a plastic skeleton; 78. a telescopic structure; 81. a measuring electrode N; 82. and measuring an electrode M.
Detailed Description
In order to make the objects, features and advantages of the present disclosure more comprehensible, the technical solutions in the embodiments of the present disclosure will be clearly described in conjunction with the accompanying drawings in the embodiments of the present disclosure, and it is apparent that the described embodiments are only some embodiments of the present disclosure, but not all embodiments. Based on the embodiments in this disclosure, all other embodiments that a person skilled in the art would obtain without making any inventive effort are within the scope of protection of this disclosure.
At present, in tunnels under construction in China, particularly urban subways, the tunnel occupancy rate of the shield method construction is large. Compared with the mountain method, the shield method construction has higher construction speed and safer construction. Therefore, construction by a shield method has become a mainstream method. However, when the shield method is adopted for construction, cutter heads and cutters can be damaged due to unclear unfavorable geology such as boulders, quicksand, karst and the like in front of the tunnel face, so that the normal tunneling of the shield machine is influenced, and even the construction safety is influenced. In order to reduce the risk of the accidents in the shield method construction, various detection and prediction methods are adopted for early warning so as to detect the bad geology and adjust or process the bad geology in time, thereby reducing the construction risk. But the detection distance of the current detection and prediction method for the stratum in front of the shield tunneling machine is shorter.
In order to improve the detection distance for detecting geology in front of a shield tunneling machine, an embodiment of the application provides a geological detection system, as shown in fig. 1, which comprises a power supply electrode system, a measuring electrode system, a data acquisition instrument and a data processing terminal, wherein the power supply electrode system comprises a power supply electrode A and an infinite power supply electrode B, and the measuring electrode system comprises a plurality of measuring electrode pairs.
The geological detection system comprises a power supply electrode system, a measuring electrode system, a data acquisition instrument 5 and a data processing terminal 4, wherein the power supply electrode system comprises an infinite power supply electrode B6 and a power supply electrode A7, and the measuring electrode system comprises a plurality of measuring electrode pairs 8.
The power supply electrode A is arranged on the side wall of the tunnel near the tunnel face, the infinity power supply electrode B is arranged on the side wall of the tunnel, which is at a first preset length away from the tunnel face, the plurality of measuring electrode pairs are arranged on the side wall of the tunnel at intervals, one end of the data acquisition instrument is electrically connected with each measuring electrode pair of the power supply electrode system and the measuring electrode system, and the other end of the data acquisition instrument is electrically connected with the data processing terminal.
Infinity power supply electrode B6 sets up on the tunnel lateral wall of face detection direction opposite direction, and the first length of predetermineeing of face apart from, in this embodiment, first length of predetermineeing sets up to be greater than 750 m's length, in other embodiments, first length of predetermineeing can set up based on the demand.
The power supply electrode A7 extends out of the shield machine through a reserved grouting duct on the 2 support ring and is arranged on the side wall 3 of the tunnel near the tunnel face.
The plurality of measuring electrode pairs 8 are arranged on the side wall of the tunnel in the direction opposite to the detection direction of the tunnel face at intervals, and the values of the intervals are two types of arrangement methods.
First kind:
the equal intervals are set, in this example typically to 2 meters, 3 meters or 5 meters, in other embodiments based on specific needs.
Second kind:
with the interval set by logarithms, in this embodiment, the logarithms generally take log 2 、log 5 Or log of 10 In other embodiments, settings may be made based on specific needs.
One end of the data acquisition instrument 5 is electrically connected with each measuring electrode pair of the power supply electrode system and the measuring electrode system, and the other end of the data acquisition instrument is electrically connected with the data processing terminal 4.
The data acquisition instrument is used for setting the power supply parameters of the power supply electrode system and acquiring a first potential difference, a second potential difference and a total field potential difference of each measuring electrode pair, wherein the first potential difference is the potential difference of the measuring electrode pair at the power supply moment, and the second potential difference is the difference value of the total field potential difference and the first potential difference.
In this embodiment, the data acquisition device 5 supplies rectangular pulse currents with alternating positive and negative to the power supply electrode A7 and the infinity power supply electrode B6, and the duty ratio is 1:1, the power supply period is 2-20 s, the power supply current is 2-8A, and the power supply voltage is 600-1000V. In other embodiments, the power supply parameters may be set based on specific requirements.
During the power supply process, the data acquisition instrument 5 acquires the first potential difference, the second potential difference and the total field potential difference of each measurement electrode pair 8. As shown in fig. 2, the potential difference Δu of each measurement electrode pair 8 at the moment of starting power supply 1 The first potential difference is the first potential difference. After a period of power supply begins, the potential difference tends to be stable, and the reaching of the potential difference deltaU is the total field potential difference. The total field potential difference DeltaU and the first potential difference DeltaU 1 Is DeltaU 2 The second potential difference is the second potential difference.
The data acquisition instrument 5 transmits the data to the data processing terminal 4 for processing after the first potential difference, the second potential difference and the total field potential difference of each measuring electrode pair 8 are acquired.
The data processing terminal is used for determining the apparent resistivity of the measuring electrode pair based on the first potential difference of the measuring electrode pair, determining the apparent polarization rate of the measuring electrode pair based on the second potential difference and the total field potential difference of the measuring electrode pair, determining the apparent charge rate of the measuring electrode pair based on the total field potential difference of the measuring electrode pair, imaging based on the apparent resistivity, the apparent polarization rate and the apparent charge rate of all measuring electrode pairs, obtaining images of the apparent resistivity, the apparent polarization rate and the apparent charge rate, and predicting the water content of the stratum in front of the palm face based on the images of the apparent resistivity, the apparent polarization rate and the apparent charge rate.
The data processing terminal 4 is based on the first potential difference DeltaU of the measuring electrode pair 8 1 The apparent resistivity of the measuring electrode pair 8 is determined, the apparent polarization of the measuring electrode pair 8 is determined based on the second potential difference and the total field potential difference of the measuring electrode pair 8, and the apparent charge rate of the measuring electrode pair 8 is determined based on the total field potential difference of the measuring electrode pair 8.
For example, there are 3 measuring electrode pairs, respectively measuring electrode pair a, measuring electrode pair b and measuring electrode pair c. The data acquisition instrument 5 acquires the first potential difference a, the second potential difference a, and the total field potential difference a of the measurement electrode pair a, the first potential difference b, the second potential difference b, and the total field potential difference b of the measurement electrode pair b, the first potential difference c, the second potential difference c, and the total field potential difference c of the measurement electrode pair c, and transmits these data to the data processing terminal 4. The data processing terminal 4 determines the apparent resistivity a of the measurement electrode pair a based on the first potential difference a, determines the apparent polarization rate a of the measurement electrode pair a based on the second potential difference a and the total field potential difference a, and determines the apparent charging rate a of the measurement electrode pair a based on the total field potential difference a. The apparent resistivity b of the measuring electrode pair b is determined based on the first potential difference b, the apparent polarization b of the measuring electrode pair b is determined based on the second potential difference b and the total field potential difference b, and the apparent charging rate b of the measuring electrode pair b is determined based on the total field potential difference b. The apparent resistivity c of the measuring electrode pair c is determined based on the first potential difference c, the apparent polarization c of the measuring electrode pair c is determined based on the second potential difference c and the total field potential difference c, and the apparent charging rate c of the measuring electrode pair c is determined based on the total field potential difference c. And finally obtaining the apparent resistivity a, the apparent polarization rate a and the apparent charging rate a of the measuring electrode pair a, measuring the apparent resistivity b, the apparent polarization rate b and the apparent charging rate b of the electrode pair b, and measuring the apparent resistivity c, the apparent polarization rate c and the apparent charging rate c of the electrode pair c.
In the scheme, the power supply electrode A is arranged on the tunnel side wall near the tunnel face, the infinity power supply electrode B is arranged on the tunnel side wall with the first preset length away from the tunnel face, and the plurality of measuring electrode pairs are arranged on the tunnel side wall in the opposite direction of the tunnel face detection direction at intervals, so that the distance between each measuring electrode and the power supply electrode A is remarkably increased, stratum and water content conditions from the vicinity of the power supply electrode A to the farther position in the detection direction can be detected, and the detection distance for detecting geology in front of the shield tunneling machine is remarkably increased.
There is also provided in an example of the present application a geological exploration system, the system comprising:
the measuring electrode pair includes a measuring electrode M and a measuring electrode N.
As shown in fig. 2, each measuring electrode pair 8 includes a measuring electrode N81 and a measuring electrode M82, and in this embodiment, the measuring electrode M82 is closer to the power supply electrode a, and in other embodiments, the measuring electrode N81 and the measuring electrode M82 may be interchanged, and the measuring electrode N81 may be disposed at the end closer to the power supply electrode a.
The data processing terminal is further used for determining a device coefficient based on the distance between the power supply electrode A and the measuring electrode M, the distance between the power supply electrode A and the measuring electrode N, the distance between the infinitely distant power supply electrode B and the measuring electrode M and the distance between the infinitely distant power supply electrode B and the measuring electrode N, multiplying the device coefficient by the first potential difference of the measuring electrode pair, dividing the first potential difference by the power supply current, and obtaining the apparent resistivity of the measuring electrode pair, wherein the power supply parameter comprises the power supply current.
The device coefficients are determined based on the distance between the supply electrode a and the measurement electrode M, the distance between the supply electrode a and the measurement electrode N, the distance between the infinitely distant supply electrode B and the measurement electrode M, and the distance between the infinitely distant supply electrode B and the measurement electrode N. The device coefficient K may be determined specifically based on the following formula:
wherein,,for the distance between supply electrode A and the measuring electrode M,/>For the distance between the infinitely distant supply electrode B and the measuring electrode M,/for>For the distance between the supply electrode a and the measuring electrode N, and (2)>The distance between the supply electrode B and the measuring electrode N is infinity.
Therefore, as long as the positions of the power supply electrode a, the infinity power supply electrode B, and the respective measurement electrode pairs are set, the corresponding device coefficient K for each measurement electrode pair can be determined.
After obtaining the device coefficient K of the measuring electrode pair, multiplying the device coefficient K by the first potential difference of the measuring electrode pair, and dividing by the supply current to obtain the apparent resistivity of the measuring electrode pair. The apparent resistivity ρ of the measurement electrode pair can be determined specifically based on the following formula s ：
Wherein DeltaU 1 To measure the first potential difference of the electrode pair, I is the supply current.
In the scheme, the apparent resistivity of the measuring electrode pair can be influenced due to geological conditions in front of the shield tunneling machine. For example, when a water-bearing layer is used in the geology in front of the shield machine, the water-bearing layer with low resistance attracts the electric lines of force of the power supply electrode a, which results in weakening the electric lines of force at the measuring electrode pair, and thus in lowering the apparent resistivity of the measuring electrode pair. Therefore, the apparent resistivity of each measuring electrode pair is determined, and the water content of the stratum in front of the shield tunneling machine can be predicted based on the apparent resistivity of each measuring electrode pair.
There is also provided in an example of the present application a geological exploration system, the system comprising:
the data processing terminal is further used for dividing the second potential difference of the measuring electrode pair by the total field potential difference of the measuring electrode pair to obtain the visual polarization rate of the measuring electrode pair.
Dividing the second potential difference of the measuring electrode pair by the total field potential difference of the measuring electrode pair to obtain the visual polarization rate of the measuring electrode pair. The visual polarizability η can be determined specifically based on the following formula s ：
Wherein DeltaU 2 To measure the second potential difference of the electrode pair, deltaU is the total field potential difference of the electrode pair.
In the scheme, the visual polarization rate of the measuring electrode pair can be influenced due to the geological condition in front of the shield tunneling machine. For example, when the water-bearing layer is used in the geology in front of the shield tunneling machine, the water-bearing layer with low resistance attracts the electric lines of force of the power supply electrode A, so that the electric lines of force at the measuring electrode pair are weakened, and further, the polarization potential at the measuring electrode pair is weakened, and the visual polarization rate is lowered. Therefore, the visual polarization rate of each measuring electrode pair is determined, and then the water content of the stratum in front of the shield tunneling machine can be predicted based on the visual polarization rate of each measuring electrode pair, and the accuracy of the predicted water content of the stratum in front of the shield tunneling machine is further improved.
There is also provided in an example of the present application a geological exploration system, the system comprising:
the data processing terminal is further configured to obtain a potential difference curve of the measurement electrode pair, determine a fixed integral from a first time point to a second time point in the potential difference curve, and divide the fixed integral by the total field potential difference to obtain a apparent charging rate of the measurement electrode pair, where the first time point is a time point when power supply is stopped, and the second time point is a time point when the potential difference becomes zero after power supply is stopped.
As shown in fig. 2, t in the figure 1 The time point for stopping power supply is the first time point. T in the figure 2 The second time point is the time point when the potential difference becomes zero after the power supply is stopped.
The apparent charge rate M of the measurement electrode pair can be determined specifically based on the following formula S ：
Wherein f (x) is a potential difference curve function of the measuring electrode pair, t 1 For the first point in time, t, in the potential difference curve 2 For the second point in time in the potential difference curve, deltaU is the total field potential difference for the measurement electrode pair.
In the above-described embodiment, the apparent charge rate is determined on the basis of the constant integral of the potential difference curve over the first time point to the second time point, i.e. the area of the potential difference curve during the discharge phase. Therefore, the apparent charge rate can eliminate external random interference on the discharge curve background, so that the water content of the stratum in front of the shield machine can be predicted based on the apparent charge rate of each measuring electrode pair, and the accuracy of the predicted water content of the stratum in front of the shield machine is further improved.
There is also provided in an example of the present application a geological exploration system, the system comprising:
the data processing terminal is further configured to obtain a potential difference curve of the measurement electrode pair, determine a constant integral from a first time point to a second time point and a constant integral from a third time point to the first time point in the potential difference curve, sum the two constant integrals to obtain a constant integral sum, divide the constant integral sum by the total field potential difference to obtain a apparent charging rate of the measurement electrode pair, where the first time point is a time point when power supply is stopped, the second time point is a time point when the potential difference becomes zero after power supply is stopped, and the third time point is a time point when power supply is started.
As shown in fig. 2, t in the figure 3 The time point for starting power supply is the third time point.
The apparent charge rate M of the measurement electrode pair can be determined specifically based on the following formula S ：
Wherein f (x) is a potential difference curve function of the measuring electrode pair, t 1 For the first point in time, t, in the potential difference curve 2 For a second point in time, t, in the potential difference curve 3 For the third point in time in the potential difference curve, deltaU is the total field potential difference for the measurement electrode pair.
In the above-described aspect, since the apparent charge rate is determined based on the constant integral of the potential difference curve from the first time point to the second time point and the constant integral of the third time point to the first time point, that is, the area of the potential difference curve in the discharge phase and the area of the potential difference curve in the charge phase. Therefore, the apparent charge rate can eliminate external random interference on the discharge curve and the background of the charge curve, so that the water content of the stratum in front of the shield machine can be predicted based on the apparent charge rate of each measuring electrode pair, and the accuracy of the predicted water content of the stratum in front of the shield machine is further improved.
There is also provided in an example of the present application a geological exploration system, the system comprising:
the data acquisition instrument is also used for acquiring the first potential difference, the second potential difference and the total field potential difference of each measuring electrode pair for a plurality of times.
The power supply parameters of each measurement electrode pair can be the same or different, and the power supply parameters can be set based on specific requirements.
The data processing terminal is further used for determining multiple apparent resistivities, apparent polarizabilities and apparent chargeability of the measuring electrode pairs based on the first potential difference, the second potential difference and the total field potential difference of each measuring electrode pair acquired for multiple times, imaging the multiple apparent resistivities, the apparent polarizabilities and the apparent chargeability of all measuring electrode pairs based on the multiple apparent resistivities, the apparent polarizabilities and the apparent chargeability of all measuring electrode pairs to obtain multiple equal apparent resistivity curves, equal apparent polarizability curves and equal apparent chargeability curves, fitting the multiple equal apparent resistivity curves, the equal apparent polarizability curves and the equal apparent chargeability curves to obtain a target equal apparent resistivity curve, a target equal apparent polarizability curve and a target equal apparent chargeability curve, comparing the target equal apparent polarizability curves and the preset image, and predicting the water content of the stratum in front of the palm face.
The preset image is typically a theoretical image, i.e. an image under preset geological conditions. In other embodiments, other preset images are possible, and may be set based on specific requirements.
In the above scheme, the first potential difference, the second potential difference and the total field potential difference of each measuring electrode pair are collected for a plurality of times to determine a plurality of apparent resistivities, apparent polarizabilities and apparent chargeabilities of the measuring electrode pairs, imaging is performed based on the plurality of apparent resistivities, apparent polarizabilities and apparent chargeability curves of all measuring electrode pairs to obtain a plurality of equal apparent resistivity curves, equal apparent polarizability curves and equal apparent chargeability curves, and fitting is performed on the plurality of equal apparent resistivity curves, the equal apparent polarizability curves and the equal apparent chargeability curves, so that a large amount of interference data in a single equal apparent resistivity curve, equal apparent polarizability curve and equal apparent chargeability curve can be removed, and further the obtained target equal apparent polarizability curve, target equal apparent polarizability curve and target equal apparent chargeability curve are more accurate, and the water content of the palm face front stratum predicted based on the target equal apparent resistivity curve, target equal apparent polarizability curve and target equal apparent chargeability curve is also more accurate.
There is also provided in an example of the present application a geological exploration system, the system comprising:
the power supply electrode A7 and/or the infinity power supply electrode B6 are soft polarized electrodes or soft non-polarized electrodes, and the measuring electrode N81 and/or the measuring electrode M82 are soft polarized electrodes.
As shown in fig. 3, when the power supply electrode A7, the infinitely distant power supply electrode B6, the measurement electrode N81 and/or the measurement electrode M82 are soft electrodes, the soft electrodes include a soft bag 61, and a bare copper wire 62, a water absorber 65, a conductive salt 66 (for example, salt) and a plastic skeleton 67 which are disposed in the soft bag, and the conductive salt solution permeates through the soft bag to the tunnel side wall 3 to form an electrical path. For easy installation, the rear end of the soft electrode is provided with a positioning and mounting rod 63. The positioning and mounting rod 63 is a stainless steel or aluminum alloy tube, and the signal transmission line 64 is disposed within the positioning and mounting rod 63.
When the power supply electrode A7 is a soft electrode, the positioning and mounting rod 63 is used for extending the power supply electrode A7 out of a reserved grouting duct on the shield machine support ring 2, and the rear end of the power supply electrode A7 is also provided with a signal transmission line 64 electrically connected with the data acquisition instrument 5.
When the power supply electrode A7 and the infinity power supply electrode B6 are soft electrodes, the electrodes can be soft polarized electrodes or soft unpolarized electrodes. When the measuring electrodes N81 and M82 are soft electrodes, the electrodes must be soft unpolarized electrodes.
In the above scheme, the power supply electrode A7, the infinity power supply electrode B6, the measurement electrode N81 and/or the measurement electrode M82 are/is set to be soft electrodes, so that the power supply electrode A7, the infinity power supply electrode B6, the measurement electrode N81 and/or the measurement electrode M8 can form good contact with surrounding rocks on the tunnel side wall 3, and the grounding condition is improved. And the reserved grouting duct is provided with the ball valve of the shield sealing device, so that the tightness of the shield is not damaged.
There is also provided in an example of the present application a geological detection method applied to a geological detection system including a power electrode a and an infinitely distant power electrode B, a measuring electrode system including a plurality of measuring electrode pairs as shown in fig. 4, a data acquisition instrument, and a data processing terminal, the method including:
step 101, collecting a first potential difference, a second potential difference and a total field potential difference of each measuring electrode pair and obtaining a power supply parameter, wherein the first potential difference is a potential difference of the measuring electrode pair at a power supply moment, and the second potential difference is a difference value between the total field potential difference and the first potential difference;
step 102, determining apparent resistivity of the measuring electrode pair based on the first potential difference of the measuring electrode pair, determining apparent polarization rate of the measuring electrode pair based on the second potential difference and the total field potential difference of the measuring electrode pair, and determining apparent charge rate of the measuring electrode pair based on the total field potential difference of the measuring electrode pair;
step 103, imaging based on the apparent resistivity, the apparent polarization rate and the apparent charging rate of all the measuring electrode pairs to obtain an equal apparent resistivity curve, an equal apparent polarization rate curve and an equal apparent charging rate curve;
Step 104, predicting the water content of the stratum in front of the face based on the isoelectric resistivity curve, the isoelectric polarization rate curve and the isoelectric charging rate curve.
There is also provided in an example of the present application a geological exploration method of determining apparent resistivity of the measurement electrode pair based on a first potential difference of the measurement electrode pair, as shown in fig. 5, the method comprising:
step 201, obtaining a distance AM between a power supply electrode A and a measuring electrode M, a distance AN between the power supply electrode A and the measuring electrode N, a distance BM between AN infinite power supply electrode B and the measuring electrode M and a distance BN between the infinite power supply electrode B and the measuring electrode N;
step 202, determining device coefficients based on the distance AM, the distance AN, the distance BM and the distance BN;
step 203, multiplying the device coefficient by the first potential difference of the measurement electrode pair, and dividing by the supply current to obtain the apparent resistivity of the measurement electrode pair, where the supply parameter includes the supply current.
There is also provided in an example of the present application a method of geological exploration, the method of determining the apparent polarizability of the measurement electrode pair based on the second potential difference and the total field potential difference of the measurement electrode pair, the method comprising:
Dividing the second potential difference of the measuring electrode pair by the total field potential difference of the measuring electrode pair to obtain the visual polarization rate of the measuring electrode pair.
There is also provided in an example of the present application a geological exploration method of determining a apparent charge rate of the measurement electrode pair based on a total field potential difference of the measurement electrode pair, as shown in fig. 6, the method comprising:
step 301, obtaining a potential difference curve of the measuring electrode pair;
step 302, determining a constant integral from a first time point to a second time point in the potential difference curve, wherein the first time point is a time point when power supply is stopped, and the second time point is a time point when the potential difference becomes zero after power supply is stopped;
step 303, dividing the fixed integral by the total field potential difference to obtain the apparent charge rate of the measuring electrode pair.
There is also provided in an example of the present application a geological exploration method, as shown in fig. 7, the method comprising:
step 401, collecting a first potential difference, a second potential difference and a total field potential difference of each measuring electrode pair for a plurality of times;
step 402, determining a plurality of apparent resistivities, apparent polarizabilities and apparent charge rates of each measuring electrode pair based on the first potential difference, the second potential difference and the total field potential difference of the measuring electrode pair acquired a plurality of times;
Step 403, imaging based on the plurality of apparent resistivity, apparent polarization rate and apparent charging rate of all the measuring electrode pairs, to obtain a plurality of equal apparent resistivity curves, equal apparent polarization rate curves and equal apparent charging rate curves;
step 404, fitting the plurality of isoview resistivity curves, the isoview polarization rate curves and the isoview charging rate curves respectively to obtain a target isoview resistivity curve, a target isoview polarization rate curve and a target isoview charging rate curve;
and step 405, comparing the target equal apparent resistivity curve, the target equal apparent polarizability curve and the target equal apparent charging rate curve with preset images, and predicting the water content of the stratum in front of the face.
According to embodiments of the present disclosure, the present disclosure also provides an electronic device and a readable storage medium.
Fig. 8 illustrates a schematic block diagram of an example electronic device 700 that may be used to implement embodiments of the present disclosure. Electronic devices are intended to represent various forms of digital computers, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. The electronic device may also represent various forms of mobile devices, such as personal digital processing, cellular telephones, smartphones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be exemplary only, and are not meant to limit implementations of the disclosure described and/or claimed herein.
As shown in fig. 8, the apparatus 800 includes a computing unit 801 that can perform various appropriate actions and processes according to a computer program stored in a Read Only Memory (ROM) 802 or a computer program loaded from a storage unit 808 into a Random Access Memory (RAM) 803. In the RAM803, various programs and data required for the operation of the device 800 can also be stored. The computing unit 801, the ROM802, and the RAM803 are connected to each other by a bus 804. An input/output (I/O) interface 805 is also connected to the bus 804.
Various components in device 800 are connected to I/O interface 805, including: an input unit 806 such as a keyboard, mouse, etc.; an output unit 807 such as various types of displays, speakers, and the like; a storage unit 808, such as a magnetic disk, optical disk, etc.; and a communication unit 809, such as a network card, modem, wireless communication transceiver, or the like. The communication unit 809 allows the device 800 to exchange information/data with other devices via a computer network such as the internet and/or various telecommunication networks.
The computing unit 801 may be a variety of general and/or special purpose processing components having processing and computing capabilities. Some examples of computing unit 801 include, but are not limited to, a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), various specialized Artificial Intelligence (AI) computing chips, various computing units running machine learning model algorithms, a Digital Signal Processor (DSP), and any suitable processor, controller, microcontroller, etc. The computing unit 801 performs the various methods and processes described above, such as geological exploration methods. For example, in some embodiments, the geological exploration method may be implemented as a computer software program tangibly embodied on a machine-readable medium, such as the storage unit 808. In some embodiments, part or all of the computer program may be loaded and/or installed onto device 800 via ROM802 and/or communication unit 809. When the computer program is loaded into RAM803 and executed by computing unit 801, one or more steps of the geological exploration method described above may be performed. Alternatively, in other embodiments, the computing unit 801 may be configured to perform the geological exploration method by any other suitable means (e.g., by means of firmware).
Various implementations of the systems and techniques described here above may be implemented in digital electronic circuitry, integrated circuitry, field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), application Specific Standard Products (ASSPs), integrated Systems On Chip (SOCs), complex Programmable Logic Devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs, the one or more computer programs may be executed and/or interpreted on a programmable system including at least one programmable processor, which may be a special purpose or general-purpose programmable processor, that may receive data and instructions from, and transmit data and instructions to, a storage system, at least one input device, and at least one output device.
Program code for carrying out methods of the present disclosure may be written in any combination of one or more programming languages. These program code may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus such that the program code, when executed by the processor or controller, causes the functions/operations specified in the flowchart and/or block diagram to be implemented. The program code may execute entirely on the machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
In the context of this disclosure, a machine-readable medium may be a tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. The machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. The machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
To provide for interaction with a user, the systems and techniques described here can be implemented on a computer having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and pointing device (e.g., a mouse or trackball) by which a user can provide input to the computer. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form, including acoustic input, speech input, or tactile input.
The systems and techniques described here can be implemented in a computing system that includes a background component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such background, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local Area Networks (LANs), wide Area Networks (WANs), and the internet.
The computer system may include a client and a server. The client and server are typically remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The server may be a cloud server, a server of a distributed system, or a server incorporating a blockchain.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps recited in the present disclosure may be performed in parallel or sequentially or in a different order, provided that the desired results of the technical solutions of the present disclosure are achieved, and are not limited herein.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present disclosure, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
The foregoing is merely specific embodiments of the disclosure, but the protection scope of the disclosure is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the disclosure, and it is intended to cover the scope of the disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.
Claims (10)
1. A geological detection system comprises a power supply electrode system, a measuring electrode system, a data acquisition instrument and a data processing terminal, wherein the power supply electrode system comprises a power supply electrode A and an infinite power supply electrode B, and the measuring electrode system comprises a plurality of measuring electrode pairs;
the power supply electrode A is arranged on the side wall of the tunnel near the tunnel face, the infinity power supply electrode B is arranged on the side wall of the tunnel, which is a first preset length away from the tunnel face, the plurality of measuring electrode pairs are arranged on the side wall of the tunnel at intervals, one end of the data acquisition instrument is electrically connected with the power supply electrode system and each measuring electrode pair of the measuring electrode system, and the other end of the data acquisition instrument is electrically connected with the data processing terminal;
the data acquisition instrument is used for setting the power supply parameters of the power supply electrode system and acquiring a first potential difference, a second potential difference and a total field potential difference of each measuring electrode pair, wherein the first potential difference is the potential difference of the measuring electrode pair at the moment of power supply, and the second potential difference is the difference value of the total field potential difference and the first potential difference;
the data processing terminal is used for determining the apparent resistivity of the measuring electrode pair based on the first potential difference of the measuring electrode pair, determining the apparent polarization rate of the measuring electrode pair based on the second potential difference and the total field potential difference of the measuring electrode pair, determining the apparent charge rate of the measuring electrode pair based on the total field potential difference of the measuring electrode pair, imaging based on the apparent resistivity, the apparent polarization rate and the apparent charge rate of all measuring electrode pairs, obtaining an equal apparent resistivity curve, an equal apparent polarization rate curve and an equal apparent charge rate curve, and predicting the water content of the stratum in front of the palm face based on the equal apparent resistivity curve, the equal apparent polarization rate curve and the equal apparent charge rate curve.
2. The geological exploration system of claim 1, comprising:
the measuring electrode pair comprises a measuring electrode M and a measuring electrode N;
the data processing terminal is further used for determining a device coefficient based on the distance between the power supply electrode A and the measuring electrode M, the distance between the power supply electrode A and the measuring electrode N, the distance between the infinitely distant power supply electrode B and the measuring electrode M and the distance between the infinitely distant power supply electrode B and the measuring electrode N, multiplying the device coefficient by the first potential difference of the measuring electrode pair, dividing the first potential difference by the power supply current, and obtaining the apparent resistivity of the measuring electrode pair, wherein the power supply parameter comprises the power supply current.
3. The geological exploration system of claim 1, comprising:
the data processing terminal is further used for dividing the second potential difference of the measuring electrode pair by the total field potential difference of the measuring electrode pair to obtain the visual polarization rate of the measuring electrode pair.
4. The geological exploration system of claim 1, comprising:
the data processing terminal is further configured to obtain a potential difference curve of the measurement electrode pair, determine a fixed integral from a first time point to a second time point in the potential difference curve, and divide the fixed integral by the total field potential difference to obtain a apparent charging rate of the measurement electrode pair, where the first time point is a time point when power supply is stopped, and the second time point is a time point when the potential difference becomes zero after power supply is stopped.
5. The geological exploration system of claim 1, comprising:
the data acquisition instrument is also used for acquiring the first potential difference, the second potential difference and the total field potential difference of each measuring electrode pair for a plurality of times;
the data processing terminal is further used for determining multiple apparent resistivities, apparent polarizabilities and apparent chargeability of the measuring electrode pairs based on the first potential difference, the second potential difference and the total field potential difference of each measuring electrode pair acquired for multiple times, imaging the multiple apparent resistivities, the apparent polarizabilities and the apparent chargeability of all measuring electrode pairs based on the multiple apparent resistivities, the apparent polarizabilities and the apparent chargeability of all measuring electrode pairs to obtain multiple equal apparent resistivity curves, equal apparent polarizability curves and equal apparent chargeability curves, fitting the multiple equal apparent resistivity curves, the equal apparent polarizability curves and the equal apparent chargeability curves to obtain a target equal apparent resistivity curve, a target equal apparent polarizability curve and a target equal apparent chargeability curve, comparing the target equal apparent polarizability curves and the preset image, and predicting the water content of the stratum in front of the palm face.
6. A geological exploration method applied to a geological exploration system, the system comprising a power supply electrode system, a measuring electrode system, a data acquisition instrument and a data processing terminal, wherein the power supply electrode system comprises a power supply electrode a and an infinity power supply electrode B, the measuring electrode system comprises a plurality of measuring electrode pairs, and the method comprises the following steps:
Collecting a first potential difference, a second potential difference and a total field potential difference of each measuring electrode pair and obtaining a power supply parameter, wherein the first potential difference is a potential difference of the measuring electrode pair at a power supply moment, and the second potential difference is a difference value between the total field potential difference and the first potential difference;
determining a apparent resistivity of the measurement electrode pair based on the first potential difference of the measurement electrode pair, determining a apparent polarization rate of the measurement electrode pair based on the second potential difference and a total field potential difference of the measurement electrode pair, and determining a apparent charge rate of the measurement electrode pair based on the total field potential difference of the measurement electrode pair;
imaging based on the apparent resistivity, the apparent polarization rate and the apparent charging rate of all the measured electrode pairs to obtain an equal apparent resistivity curve, an equal apparent polarization rate curve and an equal apparent charging rate curve;
and predicting the water content of the stratum in front of the face based on the apparent resistivity curve, the apparent polarizability curve and the apparent charging rate curve.
7. The geological exploration method of claim 1, said determining apparent resistivity of said measurement electrode pair based on a first potential difference of said measurement electrode pair comprising:
acquiring a distance AM between a power supply electrode A and a measuring electrode M, a distance AN between the power supply electrode A and the measuring electrode N, a distance BM between AN infinitely distant power supply electrode B and the measuring electrode M and a distance BN between the infinitely distant power supply electrode B and the measuring electrode N;
Determining a device coefficient based on the distance AM, the distance AN, the distance BM and the distance BN;
multiplying the device coefficient by the first potential difference of the measuring electrode pair, and dividing by the power supply current to obtain the apparent resistivity of the measuring electrode pair, wherein the power supply parameter comprises the power supply current.
8. The geological exploration method of claim 1, said determining the apparent polarizability of the measurement electrode pair based on the second potential difference and the total field potential difference of the measurement electrode pair comprising:
dividing the second potential difference of the measuring electrode pair by the total field potential difference of the measuring electrode pair to obtain the visual polarization rate of the measuring electrode pair.
9. The geological exploration method of claim 1, said determining a apparent charge rate of said measurement electrode pair based on a total field potential difference of said measurement electrode pair comprising:
acquiring a potential difference curve of the measuring electrode pair;
determining a fixed integral from a first time point to a second time point in the potential difference curve, wherein the first time point is a time point when power supply is stopped, and the second time point is a time point when the potential difference becomes zero after power supply is stopped;
dividing the fixed integral by the total field potential difference to obtain a apparent charge rate of the measurement electrode pair.
10. The geological exploration method of claim 1, further comprising:
collecting the first potential difference, the second potential difference and the total field potential difference of each measuring electrode pair for a plurality of times;
determining a plurality of apparent resistivities, apparent polarizabilities, and apparent charge rates of each measurement electrode pair based on the first potential difference, the second potential difference, and the total field potential difference of the measurement electrode pair acquired a plurality of times;
imaging based on the plurality of apparent resistivity, apparent polarization rate and apparent charging rate of all the measuring electrode pairs to obtain a plurality of equal apparent resistivity curves, equal apparent polarization rate curves and equal apparent charging rate curves;
fitting the plurality of isoview resistivity curves, the isoview polarization rate curves and the isoview charging rate curves respectively to obtain a target isoview resistivity curve, a target isoview polarization rate curve and a target isoview charging rate curve;
and comparing the target equivalent apparent resistivity curve, the target equivalent apparent polarizability curve and the target equivalent apparent charging rate curve with preset images, and predicting the water content of the stratum in front of the tunnel face.
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| CN117408417B (en) * | 2023-09-12 | 2024-06-07 | 大庆油田有限责任公司 | Comprehensive evaluation method for shallow gas cap layer of Daqing oilfield |
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