An inspection method for large-diameter boreholes with impact risk based on microseismic monitoring
A technology for microseismic monitoring and borehole inspection, which is used in earth-moving drilling, seismic signal processing, mining equipment, etc. to improve the reliability of detection results and ensure the safety of mine production.
Active Publication Date: 2021-08-06
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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Embodiment Construction
[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 a shock hazard large-diameter drilling inspection method based on microseismic monitoring, which predicts the range of the shock hazard area and the shock hazard level; and arranges a plurality of large-diameter boreholes in the predicted shock hazard area and adjacent non-impact danger areas. Drilling group; use the microseismic monitoring system to obtain the location, energy and frequency of microseismic events generated during the construction of each large-diameter drilling group; determine the impact risk area according to the location, energy and frequency of the microseismic event; The maximum microseismic energy and microseismic frequency in the adjacent areas of the drilling group, and then determine the impact risk level of each adjacent area; compare the predicted impact risk area range and impact risk level with the impact risk area and impact risk level after inspection, Complete the inspection process. The invention can check the impact risk of the predicted impact dangerous area, thereby accurately obtaining the range of the impact dangerous area and the degree of danger, and is convenient for subsequent pressure relief treatment.
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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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