Mining influence tunnel dynamic monitoring and stability evaluation method

Abstract

The invention discloses a mining influence tunnel dynamic monitoring and stability evaluation method which comprises the following steps: step 1, arranging a high-precision micro-seismic monitoring system and an introscope; step 2, collecting data before mining influence; step 3, collecting data after mining influence, wherein the specific implementation steps of the step 3 are the same as those of step 2; step 4, analyzing the stability of surrounding rock, namely respectively calculating to obtain a surrounding rock rupture range increase rate, a surrounding rock rupture energy increase rate, a surrounding rock rupture event unit volume density increase rate and a surrounding rock rupture degree increase rate based on a surrounding rupture position, surrounding rack rupture energy, surrounding rock rupture times and surrounding rock rupture degree before and after mining influence; step 5, quantitatively evaluating the tunneled tunnel stability below a coal pillar of mining influence, namely, based on surrounding rock evaluation values obtained in the step 4, establishing quantitative evaluation indexes of tunnel tunneling stability under mining influence by use of a weight analysis method, and performing quantitative evaluation on the tunneled tunnel under mining influence.

Description

technical field [0001] The invention belongs to the technical field of safety in underground engineering, and in particular relates to a method for dynamic monitoring and stability evaluation of tunnels affected by mining. Background technique [0002] With the depletion of shallow coal resources, coal mining gradually extends to the deep, the ground stress increases accordingly, and the roadway instability is serious, threatening the life safety of underground workers and affecting the normal production of coal mines. Therefore, the stability of the roadway has become a The key to coal mine safety and efficient production. [0003] During the excavation of the roadway below the coal pillar, the mining pressure generated by the mining of the upper working face has an impact on the lower excavation roadway, resulting in a decrease in the strength of the surrounding rock, large deformation of the excavation roadway, and failure of supporting components. The pressure directly ...

AI Technical Summary

Problems solved by technology

[0005] 1. During the mining process of the overlying working face, the stability of the roadway under the coal pillar and the rupture range of the surrounding rock cannot be determined

[0006] 2. At present, there is no method for dynamic monitoring and stability evaluation of roadways affected by mining

[0007] 3. In actual engineering, the stress of mining on the overlying working face and the stress of excavation on the working face under the coal pillar act on the surrounding rock together. Under the complex stress state, the failure characteristics of the surrounding rock directly affect the deformation of the roadway. At present, the impact of mining at home and abroad Research on roadway dynamic monitoring and stability evaluation methods is rare

Images