Impact risk large-diameter borehole inspection method based on micro-seismic monitoring
A technology for microseismic monitoring and borehole inspection, which is applied in earthwork drilling, seismic signal processing, mining equipment, etc., to ensure the safety of mine production and improve the reliability of inspection results.
Active Publication Date: 2021-02-19
CHINA UNIV OF MINING & TECH +1
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Problems solved by technology
However, there is currently no method to use the microseismic events induced by large-diameter drilling, and through the monitoring of the microseismic monitoring system, to inspect and determine the impact risk area and its degree of danger
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[0024] The present invention will be further described below.
[0025] This example aims at the risk of strong impact on the 205 working face of a mine in the Binchang mining area. The average buried depth of the coal seam of the working face is 950m, and the measured maximum horizontal stress is 44MPa. The coal seam is at a relatively high stress level, and shocks have occurred during the mining process. The microseismic monitoring system has been installed in the mine and can effectively surround the area of the 205 working face, and the monitoring accuracy of microseismic events in the area is relatively high; figure 1 As shown, the specific steps are:
[0026] (1) Predict the scope of the impact hazard area and the impact hazard level: use the shock wave CT inversion method to predict the impact hazard area range and impact hazard level in front of the 205 working face, such as figure 2 As shown, one of the impact risk areas is 450m-550m in front of the 205 working fac...
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The invention discloses an impact risk large-diameter borehole inspection method based on micro-seismic monitoring. The impact risk large-diameter borehole inspection method comprises the steps that an impact risky area range and an impact risk grade are predicted; a plurality of large-diameter borehole groups in the predicted impact risky area and an adjacent non-impact-risk area; the position, energy and frequency of a micro-seismic event generated in the construction period of each large-diameter borehole group are acquired by utilizing a micro-seismic monitoring system; the impact risky area is determined according to the area where the position, the energy and the frequency of the micro-seismic event are located; according to the micro-seismic maximum energy and the micro-seismic frequency of the adjacent area of each large-diameter borehole group, the impact risk grade of respective adjacent area is determined; and the predicted impact risky area range and the impact risk level are compared with the inspected impact risky area and impact risk grade to complete the inspection process. According to the impact risk large-diameter borehole inspection method, the predicted impactrisk of the impact risky area can be inspected, so that the impact risky area range and the risk degree thereof can be accurately obtained, and subsequent pressure relief treatment is facilitated.
Description
technical field [0001] The invention relates to an on-site inspection method for impact risk, in particular to an impact risk large-diameter drilling inspection method based on microseismic monitoring. Background technique [0002] The occurrence conditions of coal resources in my country are complex. In recent years, with the increase of mining depth, the stress environment of the stope has continued to deteriorate, and dynamic disasters such as rock bursts have occurred frequently, which seriously threaten the safe production of mines and the safety of personnel. Burst risk monitoring, early warning and on-site inspection are crucial to the prevention and control of rock burst. Impact risk monitoring and early warning mainly include regional microseismic monitoring and local stress online, drilling cuttings and electromagnetic radiation. After the impact risk early warning, on-site inspection measures still need to be taken to further confirm whether there is impact risk a...
Claims
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Login to View More IPC IPC(8): E21F17/00G01V1/30
CPCE21F17/00G01V1/30
Inventor 周坤友张金魁窦林名宋士康巩思园陈修超柴彦江司雷
Owner CHINA UNIV OF MINING & TECH