Arrangement method for precracking roof for roof-cutting roadway

Abstract

The invention relates to an arrangement method for a precracking roof for a roof-cutting roadway, and is particularly suitable for precracking the roof of a working face with a thick and hard roof, so as to prevent the roof from forming a large area of hanging arch at the back of the working face and further prevent coal from generating high stress to collectively cause an rock burst disaster. A roadway is tunneled where roof precracking is needed; a crossheading on the side where a goaf is positioned of the working face is communicated with a gas high collection tunnel, and the tunneled roadway is called the roof-cutting roadway; and a hole as large as the roadway is formed in the thick and hard roof of the roof-cutting roadway, so that the intensity of the roof is weakened. When the working face advances to the area of the roof-cutting roadway, the roof is broken along the precracking weakened area of the roof-cutting roadway so as to prevent the thick and hard roof from forming a large area of hanging arch at the back of the working face and further prevent the hanging arch from causing coal in front of the working face to generate high stress and collectively cause an rock burst disaster. In addition, explosion is not required when the roof is precracked with the method, so as to avoid a gas explosion disaster of a well caused by sparks of the explosion. The method has the advantages of simplicity, safety, practicality and good roof-cutting effect.

Description

technical field [0001] The invention relates to a method for arranging a pre-splitting roof in a top-cut roadway, and is especially suitable for the prevention and control of rock burst in a high-gas longwall coal mining working face with the risk of rock burst. Background technique [0002] Mineral shock is an explosive dynamic disaster caused by the sudden and violent release of a large amount of elastic deformation accumulated in coal and rock under the action of high stress. Safe and efficient production has had a great impact. The large-area suspended roof in the goaf formed by the hard and thick roof is the main factor for the high stress concentration of the coal body in the working face, especially on the side of the working face adjacent to the goaf, due to the lateral stress of the adjacent face and the overhanging Due to the influence of the advanced stress caused by the roof, rock burst disasters are more likely to occur. Pre-split hard and thick roof is the ma...

AI Technical Summary

Problems solved by technology

At present, the method of pre-splitting the roof mainly adopts the method of roof deep-hole blasting. Due to the phenomenon of "dumb gun" and blast rejection, deep-hole blasting has potential safety hazards. disaster

Due to the increasingly serious rock burst disaster caused by the thick and hard roof of coal mines, and the poor effect of the existing pre-splitting thick and hard roof technology, it is easy to induce gas disasters, etc. Effective pre-splitting roof technology is an urgent problem to be solved in this field

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