Method for preventing long-distance roof suspending of crossheading goaf based on roof cutting pressure relief

Abstract

The invention relates to the technical field of roof cutting pressure relief, in particular to a method for preventing long-distance roof suspending of a crossheading goaf based on roof cutting pressure relief. The method for preventing long-distance roof suspending of the crossheading goaf based on roof cutting pressure relief comprises the steps that by adopting a mode of combining theoretical derivation and actual measurement results, the position of a key layer is determined; a plurality of hydraulic fracturing pressure relief drilled holes obliquely drilled in the key layer through a roadway of an advance working face are formed along the trend of the roadway of the advance working face; and high-pressure water is injected into the hydraulic fracturing pressure relief drilled holes soas to conduct staged fracturing on the key layer, thus a fracture penetrating surface generating the trend approximately parallel to a coal pillar along the upper portion of a roadway coal pillar isformed in the key layer, the pressure of a roof on the upper portion of the coal pillar is released through the fracture penetrating surface, accordingly the roof suspending structure is damaged, stress transferring is cut off, therefore the roof of the crossheading goaf falls by following a roof in a working face goaf, operability is high, the roof cutting speed is high, and the roof cutting forming effect is good.

Description

technical field [0001] The invention relates to the technical field of roof cutting and pressure relief, in particular to a method for preventing long-distance ceiling suspension in goafs along the trench based on roof cutting and pressure relief. Background technique [0002] In recent years, the support concept and support technology have been greatly improved. Anchor rods, anchor cables combined with trays, steel belts, mesh and other support components have become the main support means. In order to ensure the safety and stability of the roadway during service, large The support strength of some roadways is too high. In particular, due to the effect of mine pressure after the working face is mined, the roof periodically collapses, forming a goaf in the working face. However, for the trough on both sides of the working face, due to its special roof structure and artificial support, the trough roof cannot follow the roof of the working face and fall, resulting in a long-d...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method with strong operability, convenience, fast roof cutting speed and good roof cutting forming effect based on roof cutting and pressure relief to prevent long-distance hanging of the roof in the goaf along the groove, so as to solve the problem of Technical measures such as early removal of anchor rods, anchor cables, anchors, locks, and staged mesh breaking have problems such as high production costs, cumbersome operations, poor safety, and long-distance suspended roof structures.

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