CN-121768149-B - Mine water damage early warning method based on parameter change of ground electric field

CN121768149BCN 121768149 BCN121768149 BCN 121768149BCN-121768149-B

Abstract

The application relates to the technical field of mine water damage monitoring, in particular to a mine water damage early warning method based on the parameter change of a ground electric field; the method comprises the steps of synchronously obtaining multidimensional electric field parameters in real time, carrying out time sequence feature extraction and fusion calculation on the multidimensional electric field parameters to obtain a global early warning index, generating a primary early warning signal based on the global early warning index, constructing a three-dimensional geological model based on existing geological data, generating a high risk area according to iterative growth rules, determining early warning levels of the primary early warning signal based on the high risk area and early warning thresholds of all levels, and carrying out corresponding early warning response.

Inventors

CHEN HAOGUO
CUI YANCHUN
LIU JIAQI
DAI YANJUN
CAI MINGXUAN
GU ZIANG
ZHANG LUQIONG
DONG YA
WANG PENG
DONG JIE
GAO HONGFEI

Assignees

安徽惠洲地质安全研究院股份有限公司

Dates

Publication Date: 20260508
Application Date: 20260305

Claims (10)

1. The mine water damage early warning method based on the parameter change of the ground electric field is characterized by comprising the following steps: the method comprises the steps of acquiring multidimensional electric field parameters synchronously in real time, extracting time sequence characteristics of the multidimensional electric field parameters to obtain characteristic indexes, calculating global early warning indexes based on the characteristic indexes, and generating primary early warning signals based on the global early warning indexes; Collecting geological data existing in the mining party, and constructing a three-dimensional geological model based on the geological data; responding to the primary early warning signal, and generating a high risk area according to a preset iterative growth rule based on the characteristic index and a three-dimensional geological model; And determining the early warning level of the primary early warning signal based on preset early warning thresholds of all levels, and carrying out corresponding early warning response.
2. The mine water damage warning method based on the change of the parameters of the ground electric field as set forth in claim 1, wherein the specific steps of generating the high risk area are as follows: Traversing characteristic indexes of all monitoring electrode points in the region to be monitored, and marking the monitoring electrode points with the natural potential mutation index and the resistivity change index being larger than a preset risk threshold value as high-risk seed points; initializing a high-risk area by taking each high-risk seed point as a core; performing iterative growth on any high-risk area based on a preset iterative growth rule; and if all the non-uniform cell grids at the periphery of any high-risk area no longer meet the iterative growth rule, stopping iterative growth to obtain a corresponding high-risk area.
3. The mine water damage warning method based on the change of the electric field parameters according to claim 2, wherein the iterative growth rules comprise a data similarity rule, a spatial continuity rule and a geosteering rule; Adding a non-uniform cell grid meeting data similarity rules, spatial continuity rules and geosteering rules simultaneously into the high risk area, and updating the area range and average feature matrix of the high risk area; The space continuity rule is that if any non-uniform unit grid at the periphery of any high-risk area and the corresponding high-risk area are coplanar, co-bordered or co-cornered in three-dimensional space, the non-uniform unit grid is judged to meet the space continuity rule.
4. The mine water damage warning method based on the change of the parameters of the ground electric field as set forth in claim 3, wherein the data similarity rule is as follows: Calculating arithmetic average values of the same characteristic indexes of all monitoring electrode points in each non-uniform unit grid; calculating an average characteristic matrix of all monitoring electrode points in each high-risk area, wherein the average characteristic matrix is used as a characteristic matrix of the corresponding high-risk area; and if the Euclidean distance is smaller than a preset distance threshold, judging that the non-uniform unit grids meet a data similarity rule.
5. The mine water damage warning method based on the change of the electric field parameters as recited in claim 4, wherein the geosteering rule is specifically as follows: based on the three-dimensional geological model, acquiring the azimuth of any non-uniform unit grid at the periphery of the high-risk area relative to the corresponding high-risk area; If the non-uniform unit grids are positioned in the direction of the high risk area along the stratum trend, judging that the non-uniform unit grids meet a geosteering rule, and multiplying a distance threshold value in a data similarity rule by a preset first relaxation coefficient to obtain a distance threshold value corresponding to the non-uniform unit grids; If the non-uniform unit grids are positioned in the extending direction of faults or fracture zones in a preset area at the periphery of the high risk area, judging that the non-uniform unit grids meet a geosteering rule, and multiplying a distance threshold value in a data similarity rule by a preset second relaxation coefficient to obtain a distance threshold value corresponding to the non-uniform unit grids; and if a water-resisting layer boundary or a complete rock stratum in the three-dimensional geological model exists between the non-uniform unit grid and the high-risk area, judging that the non-uniform unit grid does not meet the geosteering rule.
6. The mine water damage early warning method based on the change of the parameters of the ground electric field as set forth in claim 5, wherein the primary early warning signal is generated as follows: extracting characteristic indexes of each monitoring electrode point, wherein the characteristic indexes comprise a natural potential mutation index, an excitation current trend index and a resistivity change index; Respectively normalizing the natural potential mutation index, the excitation current trend index and the resistivity change index of each monitoring electrode point, and then carrying out weighted summation according to the weight coefficients to obtain a fusion early warning index of each monitoring electrode point; and setting a global early warning threshold value, and generating a primary early warning signal when the global early warning index is larger than the global early warning threshold value.
7. The mine water damage warning method based on the change of the parameters of the ground electric field as set forth in claim 6, wherein the extracting step of the resistivity change index specifically includes: Carrying out inversion calculation on the resistivity of all the monitoring electrode points at any sampling moment to obtain the three-dimensional resistivity distribution state of the region to be monitored at the sampling moment; gradient calculation is carried out on the three-dimensional resistivity distribution state at the sampling time t, and the resistivity space change rate of the corresponding monitoring electrode point is obtained; Taking the monitored initial moment as a reference moment, and taking the resistivity at the reference moment as a reference resistivity; Calculating the ratio of the resistivity at any sampling time t to the reference resistivity to obtain the time change rate of the resistivity of the corresponding monitoring electrode point; And carrying out weighted summation on the resistivity space change rate and the resistivity time change rate to obtain a resistivity change index.
8. The mine water damage warning method based on the change of the electric field parameter as recited in claim 7, wherein the calculating step of the three-dimensional resistivity distribution state includes: The method comprises the steps of taking a region to be monitored as a target, and establishing a three-dimensional space coordinate system, wherein the origin of the three-dimensional space coordinate system is any vertex of the region to be monitored, and the directions of an X axis, a Y axis and a Z axis are consistent with the directions of a world coordinate system; Dividing a three-dimensional space formed by the area to be monitored in the three-dimensional space coordinate system into non-uniform unit grids, and setting the resistivity of each non-uniform unit grid as an unknown parameter to be solved; constructing a forward algorithm by taking the unknown parameters as independent variables, calculating the resistivity of each non-uniform unit grid, and solving a poisson equation of a stable current field by adopting a finite element method or a finite difference method; and defining an objective function of an inversion algorithm, and solving the objective function by adopting a linearization iterative algorithm to obtain the three-dimensional resistivity distribution state of the region to be monitored.
9. The mine water damage early warning method based on the change of the electric field parameters according to claim 8, wherein the early warning level is divided into yellow early warning, orange early warning and red early warning from low to high, and the early warning level and the early warning response of the primary early warning signal are determined as follows: Setting early warning thresholds of all levels, wherein the early warning thresholds of all levels comprise a space volume critical value, an expansion rate critical value and an internal early warning index threshold value; For the primary early warning signal, if a high risk area does not exist in the area to be monitored, judging the primary early warning signal as yellow early warning, and prompting to pay attention to the global early warning index; if at least one high risk area exists in the area to be monitored, traversing each high risk area, and carrying out early warning judgment according to a preset early warning judgment rule.
10. The mine water damage early warning method based on the change of the parameters of the ground electric field as set forth in claim 9, wherein the early warning judgment rule is as follows: If the space volume of the high-risk area is larger than a space volume critical value, or the expansion rate of the high-risk area is larger than an expansion rate critical value, or the internal early warning index of the high-risk area is larger than an internal early warning index threshold value, marking the corresponding high-risk area as an emergency state; in the area to be monitored, if a high-risk area marked as an emergency state does not exist, judging the primary early warning signal as orange early warning, and marking the high-risk area in a three-dimensional geological model; And if at least one high-risk area is marked as an emergency state, judging the primary early warning signal as a red early warning and triggering an emergency audible and visual warning, and marking the high-risk area marked as the emergency state and the high-risk area not marked as the emergency state in a three-dimensional geological model by different marks.

Description

Mine water damage early warning method based on parameter change of ground electric field Technical Field The application relates to the technical field of mine water damage monitoring, in particular to a mine water damage early warning method based on the parameter change of a ground electric field. Background Along with the continuous extension of coal resource development to deep and continuous expansion of mining range to complex geological areas, mine hydrogeological conditions become more complex, and the occurrence probability and the potential hazard degree of water damage accidents also rise. Therefore, the construction of an efficient, accurate and real-time mine water damage early warning system becomes a key direction for guaranteeing the core requirement of coal mine safety production and the breakthrough of industrial technology. The traditional mine water damage early warning method mainly depends on manual hydrologic observation and drilling exploration, and has the inherent defects of information lag, low spatial resolution, difficulty in capturing water burst precursors and the like. In recent years, the field method is introduced into the field of mine water damage early warning because of the characteristic of sensitive response to underground water and capability of realizing large-scale real-time monitoring. However, the prior art scheme has certain limitations that on one hand, the threshold value judgment is carried out depending on a single parameter, the threshold value judgment is easy to be interfered by underground complex electromagnetic environment, equipment noise and the like, so that the false alarm rate and the false alarm rate are high, the early warning reliability is affected, and on the other hand, the accurate spatial positioning of the water hazard dangerous source cannot be carried out, so that the water prevention and control measures lack pertinence, are large in blindness and low in intelligent level. For example, the Chinese patent with the grant publication number of CN108104876B discloses a real-time grading early warning method and system for water damage based on mine electric method monitoring, the method adopts three-dimensional resistivity inversion to automatically and real-time process monitoring data, and automatically carries out grading judgment on the water bursting risk of a working face according to the real-time change condition of the formation resistivity of the coal measure obtained by inversion, thereby realizing the automation and the intellectualization of the water damage early warning of the working face. The problems of the prior art are that the risk judgment is carried out depending on a single parameter, so that the false alarm rate and the false alarm rate are high, the accurate positioning of the water hazard dangerous source in the three-dimensional space is not realized, and the water hazard prevention measures lack pertinence and blindness are large. The information disclosed in this background section is only for enhancement of understanding of the general background of the application and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art. Disclosure of Invention The application aims to provide a mine water disaster early warning method based on the parameter change of a ground electric field, which realizes the accurate early warning and hazard source positioning of the mine water disaster and improves the reliability and accuracy of the mine water disaster early warning by monitoring multiple parameters of the ground electric field in real time. In order to achieve the above purpose, the present application provides the following technical solutions: In a first aspect, the application provides a mine water damage early warning method based on the parameter change of a ground electric field, which comprises the following steps: the method comprises the steps of acquiring multidimensional electric field parameters synchronously in real time, extracting time sequence characteristics of the multidimensional electric field parameters to obtain characteristic indexes, calculating global early warning indexes based on the characteristic indexes, and generating primary early warning signals based on the global early warning indexes; Collecting geological data existing in the mining party, and constructing a three-dimensional geological model based on the geological data; responding to the primary early warning signal, and generating a high risk area according to a preset iterative growth rule based on the characteristic index and a three-dimensional geological model; And determining the early warning level of the primary early warning signal based on preset early warning thresholds of all levels, and carrying out corresponding early warning response. As an optimal scheme of the mine water damage early warning method based