CN111366980A - Coal mine goaf identification method and device - Google Patents
Coal mine goaf identification method and device Download PDFInfo
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- CN111366980A CN111366980A CN202010283846.6A CN202010283846A CN111366980A CN 111366980 A CN111366980 A CN 111366980A CN 202010283846 A CN202010283846 A CN 202010283846A CN 111366980 A CN111366980 A CN 111366980A
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- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
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Abstract
The application discloses a method and a device for identifying a coal mine goaf, and relates to a technology for identifying the type of the coal mine goaf. The method comprises the following steps: arranging a transient electromagnetic actual measurement point at the known goaf type position of the mine area to obtain a standard apparent resistivity curve of the goaf type; arranging a transient electromagnetic actual measurement point at the position of a known non-goaf type in a mine area to obtain a standard apparent resistivity curve of the non-goaf type; in a region to be measured in a mining area, obtaining an actually measured apparent resistivity curve of each actual measurement point in at least one actual measurement point by using a transient electromagnetic sounding method; and calculating the goaf error between each actual measurement apparent resistivity curve and each standard apparent resistivity curve, and determining the type of the goaf of the actual measurement point according to the error. The device comprises: the device comprises a sounding unit, a calculating unit and a comparing unit.
Description
Technical Field
The invention relates to the field of geological survey, in particular to a technology for identifying the type of a coal mine goaf.
Background
With the rapid development of national economy, the demand for resources is rapidly increased. With the large-scale exploitation of coal resources, a large amount of goafs are created. In the 80 s of the 20 th century, a plurality of coal mines adopt laggard room-pillar type or stub type blasting mining coal mining methods, small coal mine star chess is laid, and mine excavation is free of drawing, design and record, and no detailed record is available for the range of a goaf left after small coal mining. The goaf formed by coal mining not only causes disasters such as deterioration of local geological environment, ground collapse, inclined cracks of residential houses, farmland damage, surface water accumulation, serious deterioration of ecological environment and the like, but also harms life and property safety of people, influences safety production of coal mines and restricts economic development of mining areas. Therefore, the method has important practical significance for detecting the goaf formed in the coal mining process and the accurate position of the small coal kiln.
With the years of coal mining in China, the mining intensity of coal enterprises is increased year by year, and a goaf brings great potential safety hazards to engineering construction. At present, the detection of the goaf is usually identified according to the fixed resistivity, so that the detection and identification of the goaf are subjectively influenced.
Disclosure of Invention
It is an object of the present application to overcome the above problems or to at least partially solve or mitigate the above problems.
According to one aspect of the application, a coal mine goaf identification method is provided, and comprises the following steps:
arranging a transient electromagnetic actual measurement point at the position of a known goaf type in a mine area to obtain a standard apparent resistivity curve of the goaf type, namely a first standard apparent resistivity curve;
arranging a transient electromagnetic actual measurement point at the position of a known non-goaf type in a mine area to obtain a standard apparent resistivity curve of the non-goaf type, namely a second standard apparent resistivity curve;
in a region to be measured in a mining area, obtaining an actually measured apparent resistivity curve of each actual measurement point in at least one actual measurement point by using a transient electromagnetic sounding method;
calculating goaf errors between each measured apparent resistivity curve and the first standard apparent resistivity curve, namely first errors; and determining the type of the real measuring point goaf corresponding to the error smaller than the first error limit as the type of the goaf corresponding to the first standard apparent resistivity curve for each real measuring point.
Calculating a non-goaf error between each measured apparent resistivity curve and the second standard apparent resistivity curve, namely a second error; and determining the type of the real measuring point goaf corresponding to the error smaller than the second error limit as the type of the non-goaf for each real measuring point.
And determining the type of the real-measuring-point goaf corresponding to the error exceeding the first error limit and the second error limit at the same time as the type of the suspected goaf.
According to an aspect of the present application, there is provided a coal mine gob identifying apparatus including:
the depth measurement unit is used for obtaining a transient electromagnetic standard apparent resistivity curve, namely a first standard apparent resistivity curve, arranged at the position of a known goaf type in a mine area, and also used for obtaining a transient electromagnetic standard apparent resistivity curve, namely a second standard apparent resistivity curve, arranged at the position of a known non-goaf type in the mine area, and obtaining an actual measurement apparent resistivity curve of each actual measurement point in at least one actual measurement point arranged in a region to be measured in the mine area;
the calculation unit is used for calculating goaf errors between each measured apparent resistivity curve and the first standard apparent resistivity curve, namely first errors; the method is also used for calculating the non-goaf error between each measured apparent resistivity curve and the second standard apparent resistivity curve, namely a second error; and
the comparison unit is used for determining the type of the real-measurement-point goaf corresponding to the error smaller than the first error limit as the type of the goaf corresponding to the first standard apparent resistivity curve; determining the type of the real measuring point goaf corresponding to the error smaller than the second error limit as the type of the non-goaf; and determining the type of the real-measurement-point goaf corresponding to the error exceeding the first error limit and the second error limit at the same time as the type of the suspected goaf.
Compared with the prior art, the invention has the following beneficial effects:
the method and the device for identifying the goaf of the coal mine perform multi-point measurement in a region to be detected by using a transient electromagnetic sounding method, compare each obtained actual measurement apparent resistivity curve of the region to be detected with a first standard apparent resistivity curve and a second standard apparent resistivity curve, calculate a first error, and identify the type of the goaf of the region to be detected as the goaf or a suspected goaf according to the first error; and comparing each obtained actual measurement apparent resistivity curve of the area to be detected with a second standard apparent resistivity curve, and calculating a second error so as to identify the type of the non-goaf or the suspected goaf of the area to be detected according to the second error.
Compared with the identification performed according to the apparent resistivity in the prior art, the method can conveniently, quickly and qualitatively identify the type of the goaf of the area to be detected.
The above and other objects, advantages and features of the present application will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the present application will be described in detail hereinafter by way of illustration and not limitation with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
FIG. 1 is a schematic flow chart of a method of identifying a goaf in a coal mine in accordance with an embodiment of the present invention;
fig. 2 is a schematic structural block diagram of a coal mine gob identifying apparatus according to an embodiment of the present invention;
FIG. 3 is an observed result of a standard apparent resistivity curve of a certain coal mine in Shanxi, wherein 4 represents a standard curve of a known goaf and 5 represents a standard curve of a known non-goaf;
fig. 4 shows the result of determining the goaf type of a coal mine in shanxi.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clear, the following description is made on embodiments of the present invention with reference to the accompanying drawings, and it should be noted that, in the case of conflict, features in the embodiments and the embodiments in the present application may be arbitrarily combined with each other.
An embodiment of the present invention provides a coal mine goaf identification method, and fig. 1 shows a flowchart of an example process of a coal mine goaf identification method according to an embodiment of the present invention.
As shown in fig. 1, after the process flow starts, step S110 is first executed.
In step S110, a transient electromagnetic actual measurement point is respectively set at a position of a known goaf type in a mine area, and a standard apparent resistivity curve of the goaf type, that is, a first standard apparent resistivity curve, is obtained.
For each type of predetermined area of the known goaf types, at least one prediction point is preset on the ground of the predetermined area (for example, one or more prediction points can be arranged on the ground of the predetermined area in a profiling way), and a prediction apparent resistivity curve of each prediction point of the predetermined area is obtained by using a transient electromagnetic sounding method, so that a standard apparent resistivity curve of the predetermined area is obtained according to the prediction apparent resistivity curve of each prediction point of the predetermined area.
Meanwhile, for each type of predetermined area of the known non-goaf type, at least one prediction point is preset on the ground of the predetermined area (for example, one or more prediction points can be arranged on the ground of the predetermined area in a profile manner), and a prediction apparent resistivity curve of each prediction point of the predetermined area is obtained by using a transient electromagnetic sounding method, so that a standard apparent resistivity curve of the predetermined area, namely a second standard apparent resistivity curve, is obtained according to the prediction apparent resistivity curve of each prediction point of the predetermined area.
In this way, the standard apparent resistivity curve of the goaf or the non-goaf is obtained by using the same processing process as the process of obtaining the actual measurement apparent resistivity curve, and compared with the standard curve obtained by the analog simulation method, the comparison of the actual measurement apparent resistivity curve and the standard apparent resistivity curve of the embodiment is more meaningful, and the obtained identification result is more accurate.
Wherein the types of the predetermined area may include: the mining area without the goaf, the mining area with the goaf and the suspected goaf area. The predetermined area can be other areas of known goaf types and other areas of known non-goaf types selected in the mine area where the area to be measured is located. Accordingly, the standard apparent resistivity curve may include a first standard apparent resistivity curve, a second standard apparent resistivity curve. Wherein the first standard apparent resistivity curve is associated with a region of a goaf-free type and the second standard apparent resistivity curve is associated with a region of a goaf-free type. Particularly, when the first standard apparent resistivity curve and the second standard apparent resistivity curve are obtained in advance (by a transient electromagnetic sounding method) in other areas of known goaf types in the mining area where the actual measurement apparent resistivity curve is located, the identification result of the goaf type of the area to be measured where the actual measurement point is located is more accurate.
Then, step S120 is performed.
In step S120, in the area to be measured in the mining area, an actual measurement apparent resistivity curve of each actual measurement point in the at least one actual measurement point is obtained by using a transient electromagnetic sounding method.
Then, step S130 is performed.
In step S130, calculating an error between each measured apparent resistivity curve and each standard apparent resistivity curve; and determining the type of the standard apparent resistivity curve corresponding to the error smaller than the error limit as the type of the goaf of each actual measurement point.
For the measured apparent resistivity curve of each measured point (i.e. for each measured apparent resistivity curve), the following three errors can be calculated respectively: calculating a first error between the measured apparent resistivity curve and a first standard apparent resistivity curve, a second error between the measured apparent resistivity curve and a second standard apparent resistivity curve, and a third error between the measured apparent resistivity curve and a third standard apparent resistivity curve.
For the actually measured apparent resistivity curve of each actually measured point, a first error can be calculated according to a formula
σ1Representing a first error, pciVciAn ith measured apparent resistivity value, rho, representing the apparent resistivity curve of the measured point1iAn ith-pass observed apparent resistivity value representing the first standard apparent resistivity curve
For the actually measured apparent resistivity curve of each actually measured point, a second error can be calculated according to a formula
σ2Representing the second error, p2iThe ith measured apparent resistivity value of the second standard apparent resistivity curve is represented
By utilizing the method, the error amount between the measured apparent resistivity curve of each real measuring point and the first standard apparent resistivity curve can be calculated and obtained only through a small calculation amount, and the smaller the error between the two curves is, the closer the two curves are, the closer the goaf type between the two curves is. And determining the type of the actual measurement point as the type of the goaf according to the type of the actual measurement apparent resistivity curve corresponding to the error smaller than the first error limit.
Meanwhile, the error amount between the actually measured apparent resistivity curve of each actual measuring point and the second standard apparent resistivity curve can be calculated and obtained only through a small calculation amount, and the smaller the error between the actually measured apparent resistivity curve and the second standard apparent resistivity curve is, the closer the non-goaf type between the actually measured apparent resistivity curve and. And determining the type of the actual measurement point as a non-goaf type according to the type of the actual measurement apparent resistivity curve corresponding to the error smaller than the second error limit.
And determining the type of the measured apparent resistivity curve which is not within the two error limits as the suspected goaf type.
An embodiment of the present invention further provides a coal mine goaf identification device, as shown in fig. 2, the identification device includes:
the sounding unit 1 is used for obtaining a transient electromagnetic standard apparent resistivity curve, namely a first standard apparent resistivity curve, arranged at a position of a known goaf type in a mine area, obtaining a transient electromagnetic standard apparent resistivity curve, namely a second standard apparent resistivity curve, arranged at a position of a known non-goaf type in the mine area, and obtaining an actual measurement apparent resistivity curve of each actual measurement point in at least one actual measurement point arranged in a region to be measured in the mine area;
the calculation unit 2 is used for calculating goaf errors between each measured apparent resistivity curve and the first standard apparent resistivity curve, namely first errors; the method is also used for calculating a non-goaf error between each measured apparent resistivity curve and the second standard apparent resistivity curve, namely a second error; and
the comparison unit 3 is used for determining the type of the real-measurement-point goaf corresponding to the error smaller than the first error limit as the type of the goaf corresponding to the first standard apparent resistivity curve; determining the type of the real measuring point goaf corresponding to the error smaller than the second error limit as the type of the non-goaf; and determining the type of the real-measurement-point goaf corresponding to the error exceeding the first error limit and the second error limit at the same time as the type of the suspected goaf.
It should be noted that the above coal mine goaf identification device can perform the same processing as the corresponding steps in the above coal mine goaf identification method, and can achieve similar functions and effects, and will not be repeated here.
As can be seen from the above description, the coal mine goaf identification method and identification device according to the embodiments of the present invention perform multi-point measurement in the region to be measured by using the transient electromagnetic sounding method, compare each measured apparent resistivity curve of the region to be measured with each standard apparent resistivity curve, and identify the type of the goaf in the region to be measured according to the comparison result.
Compared with the identification performed according to attenuation curve data in the prior art, the method can accurately identify the type of the goaf of the region to be detected, and is suitable for detection of a single-layer goaf and detection of a goaf-free area.
An application example of the method for identifying the goaf of the coal mine according to the embodiment of the invention is described below with reference to fig. 3 to 4.
FIG. 3 shows the measurement results of a standard apparent resistivity curve of a coal mine in Shanxi. When the device works, a central loop device is adopted to detect the multilayer goaf. The side length of a transmitting loop is 600m, and the equivalent area of a receiving coil is 100m2In FIG. 3, the abscissa represents the observation time (in milliseconds) and the ordinate represents the observed voltage value (in microvolts/ampere-meters)2). The standard curve 4 in fig. 3 represents a first standard apparent resistivity curve measured at a position where a gob exists within the survey area. The standard curve 5 represents a second standard apparent resistivity curve measured at a position of a non-goaf within the survey area.
FIG. 4 is a plan view of the discrimination result of the goaf of a certain survey line in Shanxi mine. The measuring line direction is in the east-west direction, the distance between the measuring lines is 40 meters, the distance between the measuring points is 20 meters, the light gray solid squares represent goaf positions, the dark gray solid squares represent suspected goaf positions, and the gray dots represent the measuring point positions and the non-goaf positions. 6 denotes the known goaf location (location of first standard apparent resistivity curve acquisition) and 7 denotes the known non-goaf location (location of second standard apparent resistivity curve acquisition). And drilling verification is carried out on parts of goaf and non-goaf positions, and the accuracy is 88%.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (2)
1. A coal mine goaf identification method comprises the following steps:
arranging a transient electromagnetic actual measurement point at the position of a known goaf type in a mine area to obtain a standard apparent resistivity curve of the goaf type, namely a first standard apparent resistivity curve;
arranging a transient electromagnetic actual measurement point at the position of a known non-goaf type in a mine area to obtain a standard apparent resistivity curve of the non-goaf type, namely a second standard apparent resistivity curve;
in a region to be measured in a mining area, obtaining an actually measured apparent resistivity curve of each actual measurement point in at least one actual measurement point by using a transient electromagnetic sounding method;
calculating goaf errors between each measured apparent resistivity curve and the first standard apparent resistivity curve, namely first errors; determining the type of the goaf of the real measuring points corresponding to the error smaller than the first error limit as the type of the goaf corresponding to the first standard apparent resistivity curve for each real measuring point;
calculating a non-goaf error between each measured apparent resistivity curve and the second standard apparent resistivity curve, namely a second error; determining the type of the goaf of the actual measuring points corresponding to the error smaller than the second error limit as the type of the non-goaf for each actual measuring point;
and determining the type of the real-measurement-point goaf corresponding to the error exceeding the first error limit and the second error limit at the same time as the type of the suspected goaf.
2. A coal mine gob identification device comprising:
the depth measurement unit is used for obtaining a transient electromagnetic standard apparent resistivity curve, namely a first standard apparent resistivity curve, arranged at the position of a known goaf type in a mine area, obtaining a transient electromagnetic standard apparent resistivity curve, namely a second standard apparent resistivity curve, arranged at the position of a known non-goaf type in the mine area, and obtaining an actual measurement apparent resistivity curve of each actual measurement point in at least one actual measurement point arranged in a region to be measured in the mine area;
the calculation unit is used for calculating goaf errors between each measured apparent resistivity curve and the first standard apparent resistivity curve, namely first errors; the method is also used for calculating a non-goaf error between each measured apparent resistivity curve and a second standard apparent resistivity curve, namely a second error; and
the comparison unit is used for determining the type of the real-measurement-point goaf corresponding to the error smaller than the first error limit as the type of the goaf corresponding to the first standard apparent resistivity curve; determining the type of the real measuring point goaf corresponding to the error smaller than the second error limit as the type of the non-goaf; and determining the type of the real-measurement-point goaf corresponding to the error exceeding the first error limit and the second error limit at the same time as the type of the suspected goaf.
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| CN202010283846.6A CN111366980A (en) | 2020-04-13 | 2020-04-13 | Coal mine goaf identification method and device |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103645512A (en) * | 2013-12-10 | 2014-03-19 | 江苏大学 | Multilayer ponding goaf detection method |
| CN104749641A (en) * | 2015-04-09 | 2015-07-01 | 中国科学院地质与地球物理研究所 | Method and device for recognizing mined-out areas |
| CN105388532A (en) * | 2015-12-16 | 2016-03-09 | 辽宁工程技术大学 | Small-pit mine area unknown water-accumulated goaf identification method |
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- 2020-04-13 CN CN202010283846.6A patent/CN111366980A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103645512A (en) * | 2013-12-10 | 2014-03-19 | 江苏大学 | Multilayer ponding goaf detection method |
| CN104749641A (en) * | 2015-04-09 | 2015-07-01 | 中国科学院地质与地球物理研究所 | Method and device for recognizing mined-out areas |
| CN105388532A (en) * | 2015-12-16 | 2016-03-09 | 辽宁工程技术大学 | Small-pit mine area unknown water-accumulated goaf identification method |
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