Gob-side entry stope face hard roof ground pulse roof cutting method

Abstract

The invention provides a stope face hard roof ground pulse roof cutting method. The gob-side entry stope face hard roof ground pulse roof cutting method comprises the steps that a vertical borehole isformed in the top of a roadway, and the bottom of the borehole extends into a hard rock stratum; a borehole penetrometer is used for detecting the borehole, and the pressure of the hard rock stratumon roadway surrounding rock is judged in combination with the pressure condition; L-shaped boreholes are formed over coal pillars on the two sides of a stope face correspondingly, the vertical sections of the boreholes extend downwards from the ground to the 1/2 position of the hard rock stratum over the coal pillars, and the horizontal sections of the boreholes extend to the boundary of the hardrock stratum needing to be subjected to roof cutting in the advancing direction of the working face; hole openings of the L-shaped boreholes are sealed by using a hole packer, water injection operation is conducted through a waterway connected to a water injection port, a power supply is switched on, and fracturing is conducted by using shock waves; and the shock wave fracturing range is observedthrough a displayer connected to a controller till the two sides of the hard rock stratum in the advancing direction of the whole working face are fractured and cut off at the same time. According tothe gob-side entry stope face hard roof ground pulse roof cutting method, deviation is not prone to occurring in the detection process, the detection precision is high, meanwhile, the roof cutting speed is high, and safety is good.

Description

technical field [0001] The invention belongs to the technical field of roof cutting and pressure relief in coal mines, and in particular relates to a ground impulse roof cutting method for a hard roof in an empty roadway mining working face. Background technique [0002] At present, my country's coal mining is mainly in the underground mining mode. In this mode, the hard roof is one of the main factors for the strong mine pressure in the stope. In the process of underground mining, strong mine pressure will appear in the roadway. One of the main reasons for the strong mine pressure in the airport roadway is that the roof is hard, and there is a large overhang above the roadway, which leads to serious deformation of the roadway; The overhanging area of ​​the roof is large, and the hurricane and rock burst caused by the sudden collapse in the later period will cause damage to personnel and equipment, and affect the safe production of the mine; therefore, it is very necessary ...

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 detecti...

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