Roof cutting pressure relief protective method for exploitation stop face of fully mechanized working face

Abstract

The invention relates to a roof cutting pressure relief protective method for an exploitation stop face of a fully mechanized working face, and belongs to the technical field of surrounding rock stability protection for a permanent tunnel by the fully mechanized working face. In the protection method, the exploitation stop face of the fully mechanized working face is preset between a coal mining tunnel area and a goaf, an overlying stratum layer over the exploitation stop face is cut vertically upwardly before that a three-machine system is evacuated from the exploitation stop face to obtain aroof cutting surface, the overlying stratum layer over the exploitation stop face is disconnected from the overlying stratum layer over the coal mining tunnel area by the roof cutting surface, so that when the three-machine system is used for support, stress connection between the overlying stratum layers over the exploitation stop face and the coal mining tunnel area is cut off rapidly. Influence of high stress of the overlying stratum layer over the exploitation stop face on stress of the overlying stratum layer over the coal mining tunnel area is eliminated effectively, a dynamic pressuresource acted on the tunnel is eliminated fundamentally, a large tunnel or a concentrated tunnel of the goaf is avoided from high concentrated stress, and the permanent tunnel is kept safe and stable for long time.

Description

technical field [0001] The invention relates to the technical field of protecting the surrounding rock stability of a permanent roadway in a fully mechanized mining face, in particular to a roof cutting and pressure relief protection method on a stop mining face of a fully mechanized mining face. Background technique [0002] The repair of coal mine underground roadway is an indispensable and arduous project in the mining process. It can be as simple as repairing the bolts and cables to strengthen the support, and it is cumbersome to expand the side, pick the roof and grout and re-install the bolts and cables for reinforcement. The maintenance of roadways due to dynamic damage not only reduces the stability of surrounding rocks sharply, but also poses a serious risk of roof collapse, potentially threatening the lives of underground miners. Moreover, the cost of roadway maintenance even exceeds the cost of newly excavated roadways, which poses a huge economic security burden t...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the coal mining roadway in the coal mining area is subjected to strong mining stress after the two sides or one side of the working face stop mining, thus causing strong deformation and damage of the roadway, and it is difficult to ensure the long-term safe use of the permanent roadway in the mining area The problem

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