A ground pulse cutting method for hard roof in mining working face

Abstract

A ground pulse cutting method for the hard roof of the mining working face of an empty roadway. A vertical borehole is opened on the top of the roadway, and the bottom of the borehole extends into the hard rock formation; the borehole is detected by a penetrometer. Combined with the pressure conditions, the pressure of the hard rock formation on the roadway surrounding rock is judged; L-shaped drilling holes are opened directly above the coal pillars on both sides of the mining face, and the vertical section extends downward from the ground to 1 of the hard rock formation directly above the coal pillar. / 2 position, its horizontal section extends along the advancing direction of the working face to the boundary of the hard rock strata that needs to be cut; use a hole sealer to seal the opening of the L-shaped drill hole, and perform water injection operations through the waterway connected to the water injection port , turn on the power, and use the shock wave to perform fracturing; observe the range of shock wave fracturing through the display connected to the controller, until both sides of the hard rock formation in the advancing direction of the entire working face are simultaneously fracturing and cut off. The detection process of the method is not prone to deviation, and the detection accuracy is high. At the same time, the top cutting speed is fast and the safety is good.

Description

Technical field [0001] The present invention belongs to the technical field relief toppers coal, in particular to a gateway overhead ground working face hard roof toppers pulse method. Background technique [0002] At this stage, my country's main coal mining to underground mining mode, this mode, the hard roof is one of the main stope underground pressure of strong factors. In the underground mining process, the roadway will be strong strata behaviors. Strata strong overhead roadway because one of the main roof hard, large overhang above the top of the roadway, the roadway cause serious deformation; Another reason is that after pushing face, a hard coating on the overhead roadway Gob roof overhang roof area, the latter produced a sudden collapse of the hurricane and impact pressure can cause damage to personnel, equipment, the impact of mine safety; therefore, cut hard top roof of working face relief is necessary in order to eliminate safety problems, a need to provide a method ...

AI Technical Summary

Problems solved by technology

However, because the original borehole penetration method only installs a single probe on the probe, not only the test orientation is prone to deviation when detecting the surrounding rock of the borehole, but also the test data is not accurate enough, which further increases the safety production work of the coal mine. Hidden danger

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