CN109297396B - Method and system for detecting position of drill hole in roadway - Google Patents
Method and system for detecting position of drill hole in roadway Download PDFInfo
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- CN109297396B CN109297396B CN201811390216.8A CN201811390216A CN109297396B CN 109297396 B CN109297396 B CN 109297396B CN 201811390216 A CN201811390216 A CN 201811390216A CN 109297396 B CN109297396 B CN 109297396B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
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Abstract
The invention discloses a method and a system for detecting the position of a drill hole in a roadway, wherein the method comprises the following steps: arranging a first power supply electrode at a position of a drill hole exposed on the ground, and burying a second power supply electrode in the ground surface away from the drill hole by a first preset distance, wherein the first power supply electrode is used for supplying power to the drill hole; arranging a first measuring electrode and a second measuring electrode in the roadway, wherein the first measuring electrode is used for measuring potential values at different positions in the roadway, and the second measuring electrode is used as an infinite electrode; measuring potential values of a plurality of position points in the roadway, and generating a potential curve according to the potential values of the plurality of position points and the positions of the plurality of position points in the roadway direction; and determining the position of the drilling hole corresponding to the roadway direction by determining the position corresponding to the maximum value of the potential value in the potential curve in the roadway direction. The method provided by the invention can detect the position of the front drilled hole in the roadway, and provides convenience for underground construction of a coal mine.
Description
Technical Field
The invention relates to the field of underground coal mine detection, in particular to a method and a system for detecting a position of a drill hole in a roadway.
Background
When carrying out colliery underground construction, the accurate position of drilling is hardly obtained, can't detect the position of tunnel the place ahead drilling in the tunnel direction in the work progress, and this has brought the inconvenience for the underground construction in colliery.
Disclosure of Invention
The invention aims to provide a method and a system for detecting the position of a drill hole in a roadway, which can detect the position of the drill hole in the roadway direction.
The invention provides a method for detecting the position of a drill hole in a roadway, which comprises the following steps:
arranging a first power supply electrode at a position of a drill hole exposed on the ground, and burying a second power supply electrode in the ground surface away from the drill hole by a first preset distance, wherein the first power supply electrode is used for supplying power to the drill hole;
arranging a first measuring electrode and a second measuring electrode in the roadway, wherein the first measuring electrode is a movable electrode and is used for measuring potential values at different positions in the roadway, and the second measuring electrode is arranged at the far end and serves as an infinite electrode;
measuring potential values of a plurality of position points in a roadway, and generating a potential curve according to the potential values of the position points and the positions of the position points in the roadway direction;
and determining the position of the drilling hole corresponding to the roadway direction by determining the position of the maximum value of the potential value in the potential curve corresponding to the roadway direction.
Optionally, the determining a position in the lane direction corresponding to a maximum value of the potential value in the potential curve includes:
fitting the potential curve through a first preset fitting function to obtain a first fitting curve;
and determining the position, corresponding to the maximum value of the potential value, in the first fitting curve in the roadway direction.
Optionally, the determining a position in the lane direction corresponding to a maximum value of the potential value in the potential curve includes:
the potential curve is subjected to derivation to obtain a potential derivative curve;
fitting the potential derivative curve through a second preset fitting function to obtain a second fitting curve;
and determining the position of the second fitting curve in the roadway direction corresponding to the zero-crossing point.
Optionally, the measuring potential values of a plurality of position points in the lane includes:
and measuring potential values of a plurality of position points in the roadway point by point according to a preset interval.
Optionally, the measuring the potential values of a plurality of position points in the roadway at preset intervals includes:
selecting a measuring range with a preset length in the roadway as a measuring interval of the first measuring electrode;
and measuring the potential values of a plurality of position points in the measuring range in the roadway according to the preset distance.
Optionally, the first preset distance is greater than 1 km.
A second aspect of the present invention provides a system for detecting a position of a borehole in a roadway, comprising: the power supply device is connected with a first power supply electrode and a second power supply electrode, the first power supply electrode is arranged at the position, exposed on the ground, of a drill hole, the second power supply electrode is buried in the ground surface at a first preset distance from the drill hole, the power supply device supplies power to the drill hole through the first power supply electrode, the receiving device is connected with a first measuring electrode and a second measuring electrode, the first measuring electrode is arranged in the tunnel and serves as a movable electrode, the second measuring electrode is arranged at the far end and serves as an infinite electrode, the receiving device acquires potential values of a plurality of position points in the tunnel through the first measuring electrode, and generates a potential curve according to the potential values of the position points and the positions of the position points in the tunnel direction;
the receiving device is further used for determining the position, in the roadway direction, corresponding to the maximum value of the potential value in the potential curve, so that the position, in the roadway direction, of the drill hole is determined.
Optionally, the receiving apparatus is further configured to: fitting the potential curve through a first preset fitting function to obtain a first fitting curve; and determining the position, corresponding to the maximum value of the potential value, in the first fitting curve in the roadway direction.
Optionally, the receiving apparatus is further configured to: the potential curve is subjected to derivation to obtain a potential derivative curve; fitting the potential derivative curve through a second preset fitting function to obtain a second fitting curve; and determining the position of the second fitting curve in the roadway direction corresponding to the zero-crossing point.
Optionally, the power supply device is connected to the first power supply electrode and the second power supply electrode through a first cable and a second cable, and the receiving device is connected to the first measuring electrode and the second measuring electrode through a third cable and a fourth cable.
The power supply device is arranged at the position of the drill hole, the drill hole is charged through the first power supply electrode, the potential values of a plurality of position points in the tunnel are obtained through the receiving device in the tunnel, a potential curve is generated according to the potential values and the positions, corresponding to the position points, of the plurality of position points in the tunnel direction, the abscissa of the potential curve can be determined according to the maximum value of the potential values in the potential curve according to the distribution condition of an electric field, and therefore the position of the drill hole in the tunnel direction can be determined.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, alternative embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 shows a flow chart of a method of detecting borehole position in a roadway provided by the present invention;
FIG. 2 is a schematic diagram of a construction layout of a method for detecting a position of a borehole in a roadway according to the present invention;
FIG. 3 illustrates another flow chart of a method of detecting borehole location in a roadway provided by the present invention;
FIG. 4 illustrates another flow chart of a method of detecting borehole location in a roadway provided by the present invention;
FIG. 5 is a graph showing potential profiles in a roadway in a method of detecting a location of a borehole in a roadway provided by the present invention;
FIG. 6 is a graph showing potential derivatives in a roadway in a method of detecting borehole location in a roadway provided by the present invention;
fig. 7 shows a schematic diagram of a system for detecting borehole location in a roadway provided by the present invention.
Icon:
a power supply device-100; receiving device-101.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements.
In the description of the present invention, it should also be noted that relational terms such as first and second, and the like, may be used solely herein to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. The terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
First embodiment
The electric charging method is an electric prospecting method for directly charging good conductors exposed on the ground, in tunnels or in drill holes and knowing the size of an ore body by observing the spatial distribution of a charging field, and is mainly applied to the detection of metal ores or underground water flow.
The embodiment provides a method for detecting a drilling position in a roadway, wherein a charging method is applied to the underground of a coal mine, a metal observation hole with a smaller hole diameter can be detected in the underground roadway and is positioned at the position in the roadway direction, convenience can be brought to the actual production construction process of the underground coal mine by determining the drilling position, for example, the drilling can be found by adopting the shortest distance of a tunneling roadway during construction, and the excavation of a waste roadway is avoided, please refer to fig. 1, and the method for detecting the drilling position comprises the following steps:
step 10: and arranging a first power supply electrode at the position of the drilled hole exposed on the ground, and burying a second power supply electrode in the ground surface at a first preset distance away from the drilled hole.
Referring to fig. 2, a first power supply electrode a connected to a positive electrode of a power supply is in contact with an exposed part of a borehole exposed to the ground, a contact point of the first power supply electrode a is a charging point, the first power supply electrode a charges the borehole through the contact point, a sleeve is arranged in the borehole and serves as a conductive conductor, charging current is distributed in the borehole in full depth, a second power supply electrode B connected to a negative electrode of the power supply is arranged as an infinite pole, so that an electric field generated by the second power supply electrode B near the conductor can be ignored, and as an optional implementation mode, the second power supply electrode B is arranged at a distance away from the exposed part of the borehole and buried in the ground surface, wherein the distance can be more than one thousand meters.
Step 11: and arranging a first measuring electrode and a second measuring electrode in the tunnel, wherein the first measuring electrode is used for measuring potential values at different positions in the tunnel, and the second measuring electrode is arranged at the far end.
In a coal mine underground roadway, a second measuring electrode N is arranged on a certain fixed base point which is far enough away from a charging point in the roadway and serves as an infinite electrode, a first measuring electrode M can move point by point along a measuring line in the roadway, a measuring point of the first measuring electrode M is changed, and electric potentials at different positions in the roadway can be measured.
Step 12: and measuring the potential values of a plurality of position points in the roadway, and generating a potential curve according to the potential values of the plurality of position points and the positions of the plurality of position points in the roadway direction.
The first measuring electrode M is used as a movable electrode and moves along a measuring line, potential values of a plurality of positions in the roadway are measured, the measured potential value is used as a Y axis, and the position of the first measuring electrode M in the roadway direction during measurement is used as an X axis, so that a potential curve is generated. The position of the first measuring electrode M in the direction of the roadway may be understood as that the position of the first measuring electrode M when the first measuring electrode M is first measured is taken as an origin, the position of the first measuring electrode M is gradually moved, and the distance length from the origin is the position of the first measuring electrode M in the direction of the roadway.
Step 13: and determining the position of the drilling hole corresponding to the roadway direction by determining the position corresponding to the maximum value of the potential value in the potential curve in the roadway direction.
The working mode of the charging method can be divided into potential measurement and potential gradient measurement, because of the explosion-proof requirement of the coal mine and the limited construction range of the mine, the charging method adopted by the embodiment is potential measurement, and the potential expression of the potential measurement is as follows:
in the formula, I represents supply current, rho represents formation resistivity, and rAMThe distance between a and M is represented, that is, the smaller the distance between the first measuring electrode M and the first power supply electrode a is, the larger the potential value measured in the tunnel is, and therefore, the higher the potential value measured as the first measuring electrode M is closer to the borehole, the maximum value of the ordinate, that is, the maximum value of the potential value is determined from the potential curve obtained in step 12, and the abscissa corresponding to the maximum value, that is, the abscissa corresponding to the maximum value is determinedThe first measuring electrode is positioned at the position in the roadway direction when the electric potential is measured, so that the roadway is taken as the horizontal position, and the drilled hole is positioned at the horizontal position corresponding to the roadway direction.
It should be noted that the position of the drill hole obtained in the direction of the drift should be understood as a range of positions, not as an exact position point, because the measurement cannot be sufficiently accurate and various errors occur in practical situations.
According to the scheme, the position of the drill hole in the roadway direction is detected by adopting a charging method, the electric change on the depth section of a certain measuring line in the roadway can be reflected by the charging method, for one measuring line, the electric section is cut out on the level, the potential change on the measuring line can be seen from a generated potential curve, the higher the potential value is measured by analyzing a potential measurement formula, the closer the measuring line is to the drill hole, and therefore the position of the drill hole in the roadway direction can be determined by the potential change on the measuring line.
Optionally, one embodiment of measuring the potential values at a plurality of positions in the lane in the step 12 is as follows: and measuring potential values at a plurality of positions in the roadway according to the preset distance.
According to the preset distance, the measuring position of the first measuring electrode is changed at equal intervals by taking the position of the first measuring electrode for measuring for the first time as a starting point, and the abscissa intervals of the generated potential curve are equal, so that the maximum value of the potential in the potential curve and the abscissa corresponding to the maximum value are determined more accurately.
Optionally, because the length of the tunnel is too long, only a measurement range with a certain length in the tunnel can be selected as a measurement interval of the first measurement electrode during actual measurement; the first measuring electrode measures potential values of a plurality of positions in the roadway in the interval according to the preset distance, and the measuring workload can be effectively reduced.
Optionally, referring to fig. 3, one embodiment of determining the position in the lane direction corresponding to the maximum value of the potential value in the potential curve in step 13 includes:
step 121: and fitting the potential curve through a first preset fitting function to obtain a first fitting curve.
Because a plurality of measured potential values are discrete data points, a potential curve generated according to the discrete data points is not accurate enough, a series of discrete data points in coordinates can be connected by a smooth curve through a preset fitting function, fitting curves generated by different preset fitting functions are different, and in practical application, the potential curve can be freely set according to actual conditions.
Step 122: and determining the position of the maximum value of the potential value in the first fitting curve in the roadway direction.
The potential curve is generated by discrete data points, so that the maximum value of the potential in the potential curve and the actual maximum value of the potential are possibly deviated, the first fitted curve obtained after fitting is more visual, the data are more accurate, the maximum value of the potential in the first fitted curve is used as the maximum value of the potential curve, the abscissa corresponding to the maximum value of the potential in the first fitted curve is determined, and the position of the drill hole corresponding to the roadway direction can be obtained according to the distance length between the abscissa and the origin.
In the above, another embodiment may also be implemented to determine the position in the lane direction corresponding to the maximum value of the potential value in the potential curve, with reference to fig. 4:
step 20: and (4) carrying out derivation on the potential curve to obtain a potential derivative curve.
Step 21: and fitting the potential derivative curve through a second preset fitting function to obtain a second fitting curve.
Step 22: and determining the position corresponding to the zero crossing point of the second fitting curve in the roadway direction.
Another implementation manner of determining the zero crossing point of the potential derivative curve by deriving the potential curve is step 13, and as the derivative of the extreme point on the curve is zero, the zero crossing point of the potential derivative curve is the extreme point of the potential curve, and as the potential derivative curve is derived from the discrete potential value, the potential derivative curve is fitted, so that the obtained value is more accurate.
Taking an example to illustrate the solution in this embodiment, referring to fig. 5 as a potential curve of potential values obtained in a tunnel, where an abscissa is a potential curve with a first measurement position as a starting point, a measurement distance of a first measurement electrode is a variable, and an ordinate is a measured potential value, two curves in the graph, one curve being an actually measured potential curve, and the other curve being a first fitted curve, it can be seen in fig. 5 that a 10m to 40m section of potential in the first fitted curve continuously rises, indicating that the measurement point is closer to an emission source, and a 40m to 100m section of potential in the whole continuously falls, indicating that the measurement point is farther from the emission source, and it is determined that a maximum value should be located near 40m to 50m according to the first fitted curve, and since the maximum value of the first fitted curve should be a position in the tunnel closest to a drill hole, it can be determined that the drill hole is located around 40m to 50m in the direction of the.
Referring to fig. 6, in order to observe the area where the maximum value appears more clearly, this embodiment provides another implementation manner, a derivative of a plurality of measured potential values is calculated to generate a potential derivative curve, two curves in fig. 6, one curve is a potential derivative curve, and the other curve is a second fitting curve, since the potential value is maximum when the derivative of the potential value is zero, the maximum value of the potential curve can be determined by the zero crossing point of the second fitting curve, and it can be seen from the second fitting curve that the zero crossing point is about 45m to 50m, it can be determined that the borehole is located about 45m to 50m in the roadway direction, and the positions of the zero crossing points of the fitting curves formed by different fitting functions are substantially consistent.
The method provided by the embodiment can effectively find out the position of the drilled hole underground through a charging method, so that the drilled hole can be found out by adopting the shortest distance of a tunneling roadway, the tunneling of a waste roadway is avoided, and meanwhile, a technical foundation is laid for the subsequent water source well by utilizing the existing ground hydrological drilled hole.
Second embodiment
The present embodiment provides a system for detecting a position of a borehole in a roadway, referring to fig. 7, including: the power supply device 100 is connected with a first power supply electrode A through a first cable, and is connected with a second power supply electrode B through a second cable, the first power supply electrode A is arranged at an exposed position of a drilled hole exposed on the ground surface, for example, the first power supply electrode A is connected with a metal sleeve of the drilled hole, the power supply device 100 supplies power to the drilled hole through the first power supply electrode A, and the second power supply electrode B connected with the power supply device 100 is buried in the ground surface which is a certain distance away from the drilled hole and is used as an infinite electrode; the receiving device 101 is connected with the first measuring electrode M through a third cable, and is connected with the second measuring electrode N through a fourth cable, the first measuring electrode M is arranged in the roadway and serves as a movable electrode, the second measuring electrode N is arranged at the far end in the roadway and serves as an infinite electrode, the receiving device 101 obtains potential values of a plurality of position points in the roadway through the first measuring electrode M, and a potential curve is generated according to the potential values of the position points and the positions of the position points in the roadway direction.
The receiving device 101 is further configured to determine a position in the roadway direction corresponding to a maximum value of the potential value in the potential curve, so as to determine a position in the roadway direction corresponding to the borehole.
Optionally, the receiving apparatus 101 is further configured to: fitting the potential curve through a first preset fitting function to obtain a first fitting curve; and determining the position of the maximum value of the potential value in the first fitting curve in the roadway direction.
Optionally, the receiving apparatus 101 is further configured to: carrying out derivation on the potential curve to obtain a potential derivative curve; fitting the potential derivative curve through a second preset fitting function to obtain a second fitting curve; and determining the position corresponding to the zero crossing point of the second fitting curve in the roadway direction.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process of the system described above may refer to the corresponding process in the foregoing method, and will not be described in too much detail herein.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a notebook computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above description is only an alternative embodiment of the present invention and is not intended to limit the present invention, and various modifications and variations of the present invention may occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A method of detecting a location of a borehole in a roadway, comprising:
arranging a first power supply electrode at a position of a drill hole exposed on the ground, and burying a second power supply electrode in the ground surface away from the drill hole by a first preset distance, wherein the first power supply electrode is used for supplying power to the drill hole;
arranging a first measuring electrode and a second measuring electrode in the roadway, wherein the first measuring electrode is a movable electrode and is used for measuring potential values at different positions in the roadway, and the second measuring electrode is arranged at the far end and serves as an infinite electrode;
measuring potential values of a plurality of position points in a roadway, and generating a potential curve according to the potential values of the position points and the positions of the position points in the roadway direction;
determining the position of the drilling hole corresponding to the roadway direction by determining the position of the maximum value of the potential value in the potential curve corresponding to the roadway direction;
the determining the position, in the lane direction, corresponding to the maximum value of the potential value in the potential curve includes:
the potential curve is subjected to derivation to obtain a potential derivative curve;
fitting the potential derivative curve through a second preset fitting function to obtain a second fitting curve;
and determining the position of the second fitting curve in the roadway direction corresponding to the zero-crossing point.
2. The method of claim 1, wherein measuring potential values for a plurality of location points in a lane comprises:
and measuring potential values of a plurality of position points in the roadway point by point according to a preset interval.
3. The method of claim 2, wherein measuring potential values for a plurality of location points in a lane at a predetermined spacing comprises:
selecting a measuring range with a preset length in the roadway as a measuring interval of the first measuring electrode;
and measuring the potential values of a plurality of position points in the measuring range in the roadway according to the preset distance.
4. The method of claim 1, wherein the first predetermined distance is greater than 1 km.
5. A system for detecting borehole location in a roadway, comprising: the power supply device is connected with a first power supply electrode and a second power supply electrode, the first power supply electrode is arranged at the position, exposed on the ground, of a drill hole, the second power supply electrode is buried in the ground surface at a first preset distance from the drill hole, the power supply device supplies power to the drill hole through the first power supply electrode, the receiving device is connected with a first measuring electrode and a second measuring electrode, the first measuring electrode is arranged in the tunnel and serves as a movable electrode, the second measuring electrode is arranged at the far end and serves as an infinite electrode, the receiving device acquires potential values of a plurality of position points in the tunnel through the first measuring electrode, and generates a potential curve according to the potential values of the position points and the positions of the position points in the tunnel direction;
the receiving device is further used for determining the position, in the roadway direction, corresponding to the maximum value of the potential value in the potential curve, so that the position, in the roadway direction, of the drill hole is determined; the receiving device is specifically configured to:
the potential curve is subjected to derivation to obtain a potential derivative curve;
fitting the potential derivative curve through a second preset fitting function to obtain a second fitting curve;
and determining the position of the second fitting curve in the roadway direction corresponding to the zero-crossing point.
6. The system of claim 5, wherein the power supply device is connected to the first power supply electrode and the second power supply electrode through a first cable and a second cable, respectively, and the receiving device is connected to the first measuring electrode and the second measuring electrode through a third cable and a fourth cable, respectively.
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| CN102681017A (en) * | 2012-05-31 | 2012-09-19 | 河北煤炭科学研究院 | Amplitude-frequency electric perspective detection method |
| CN103995295A (en) * | 2014-06-11 | 2014-08-20 | 中煤科工集团西安研究院有限公司 | Direct current electric method ground hole detection method and device |
| CN104991281A (en) * | 2015-06-17 | 2015-10-21 | 中国科学院地质与地球物理研究所 | Detection method and device of buried depth of coal seam |
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