A preventive method for coal-rock dynamic disasters in coal mine excavation roadway

Abstract

This application discloses a method for preventing and controlling coal-rock dynamic disasters in a coal mine tunneling roadway, which includes: controlling the drilling machine to sequentially construct the first drilling hole and the second drilling hole in front of the tunneling roadway; throwing a steel ball into the drill pipe to block the Hold the water outlet hole of the drill bit, and adjust the high-pressure water pump matched with the drilling rig to the preset cutting pressure, so that the ejector starts to rotate and spray liquid through the jet hole on the ejector to cut the second drill hole; when the first drill hole When liquid flows out, the drill rod is controlled to withdraw outward from the second drilling hole at a preset retreat speed until the drill rod completely withdraws from the second drilling hole. This application can greatly improve the pressure relief space of the pressure relief hole by constructing the pressure relief borehole in front of the excavation head in advance and carry out hydraulic reaming and cutting of the borehole, and can significantly reduce or even eliminate the pressure relief caused by ground stress or gas stress. The occurrence of rock burst or coal and gas accidents ensures the safety of life and property of underground operators.

Description

technical field [0001] The present application relates to the technical field of coal mining, in particular to a method for preventing and controlling coal-rock dynamic disasters in coal mine excavation roadways. Background technique [0002] The front of the excavation roadway is one of the key areas where coal-rock dynamic disasters such as rock bursts and coal and gas outbursts occur. Due to the intensive operation of the excavation roadway and the narrow working space, once an accident occurs, it is easy to cause mass death and injury, which is extremely harmful. big. [0003] In order to prevent the occurrence of coal-rock dynamic disasters in tunneling roadways, the common method at present is to construct large-diameter coal seam drilling or blasting holes in front of the tunneling head. Large-diameter drilling has a small space for pressure relief. If it is implemented in large quantities, the amount of work required will be large and the time will be long, which wi...

AI Technical Summary

Problems solved by technology

Large-diameter drilling has a small space for pressure relief. If it is implemented in large quantities, the amount of work required will be large and the time will be long, which will seriously affect the speed of excavation. Normal excavation and blasting at the same time still have potential safety hazards such as blind blasting, residual explosion, and induced impact or gas explosion, which is not conducive to safety management

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