Stope face impact risk pre-mining pre-evaluation method

Abstract

The invention provides a stope face impact risk pre-mining pre-evaluation method. Evaluation is conducted by arranging a certain number of focuses and detectors in an open-off cut or an air return way or a transportation roadway of a stope face which is pre-estimated before mining and utilizing an earthquake CT detection technology. The stope face impact risk pre-mining pre-evaluation method includes the steps that the longitudinal wave velocities vz, vl and v0 of earthquake waves in an immediate roof, an upper roof and a coal bed of the stope face are determined; the thickness hz of the immediate roof of the stope face and the distance h0 from the focuses to the bottom surface of the immediate roof are determined; the allowed minimum value xzl of the focus inspection distance is calculated; a detection zone rock stratum dynamic failure comprehensive probability index two-dimensional distribution diagram is obtained, and rock stratum dynamic failure dangerous zones and levels of the dangerous zones in a detection zone are determined; roadway impact dangerous zones of the stope face and the levels of the roadway impact dangerous zones are determined. According to the stope face impact risk pre-mining pre-evaluation method, the influence of interference waves can be effectively eliminated, pre-estimation accuracy is improved, working efficiency is improved, resources are saved, and actual risk relieving work can be more conveniently guided.

Description

technical field [0001] The invention relates to a method for evaluating impact risk, in particular to a pre-mining pre-evaluation method for impact risk of mining face. Background technique [0002] In recent years, my country's coal mine rock burst disasters have become increasingly serious, causing huge property losses and casualties. Comprehensive and accurate rock burst risk assessment is the basis for targeted prevention and control of rock burst disasters. At present, according to different application stages, impact risk assessment of working faces can be divided into two categories: ① risk pre-assessment after working face penetration and before mining; ② real-time risk assessment during mining. The electromagnetic radiation method, mining stress monitoring method, microseismic method, geoacoustic method, etc., which use online monitoring equipment as the main means, are generally used for real-time evaluation in the mining process. [0003] In terms of pre-evaluati...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a pre-mining pre-evaluation method for the impact risk of a mining face, which is used to solve the problems of poor pertinence, low accuracy, and time-consuming and labor-intensive operations in the existing pre-evaluation method for the impact risk of a mining face.

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