Processing method of upper corner hanging arch on mine working face

Abstract

The invention relates to the technical field of mine construction, in particular to a processing method of an upper corner hanging arch on a mine working face. The processing method of the upper corner hanging arch on the mine working face comprises the steps that before advanced bearing pressure disturbance formed by working face stoping, two rows of drill holes are correspondingly formed in thepositions, on top plates of stoping roadways, on the two sides of the working face in advance; and high-pressure water is correspondingly injected into each drill hole to perform hydraulic fracturingon top covers, so that cracks are generated and extended on the top covers. According to the processing method of the upper corner hanging arch on the mine working face, the integrity of the top covers above a working face end head coal seam can be damaged, the strength of the top covers is reduced, the purpose of before-mining stability and post-mining timely falling of the upper corner hanging arch of a high gas mine working face is achieved, the upper corner hanging arch area of the stoping working face is obviously reduced, gas accumulation and overrun of the upper corner hanging arch of the working face is effectively prevented, and the safety is high.

Description

technical field [0001] The invention relates to the technical field of mine construction, in particular to a method for treating a corner suspended roof on a mine working face. Background technique [0002] The overhanging area of ​​the upper corner corners on both sides of the fully mechanized mining face in high-gas mines is too large, which may easily lead to gas accumulation in the upper corner of the return airway and cause over-limit accidents, which will seriously endanger the normal recovery and safe production of the fully mechanized mining face. [0003] At present, the traditional delayed shallow hole blasting or advanced drilling and pre-splitting blasting are mainly used to weaken the upper corner roof of the working face. However, the depth of the weakened roof in these two ways is shallow, and the effect of controlling the overhang area of ​​the triangular area at the end of the working face is not ideal. Among them, when shallow hole blasting is used to weak...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for treating the overhang of the upper corner of the mine working face, so as to solve the problem that the area of ​​the overhanging roof of the upper corner of the working face is too large during the mining of high-gas mines in the prior art, and the gas is prone to exceed the limit, which affects the safe mining of the working face. The problem

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