Method for performing coal and rock repeated hole drilling to form roadway scouring weakening preventing structure

Abstract

The invention discloses a method for performing coal and rock repeated hole drilling to form a roadway scouring weakening preventing structure. A drilling machine is utilized for drilling a hole in anassigned position, repeated rotating is performed to fracture a coal and rock mass, a roadway scouring weakening preventing structural layer is formed, and energy released by impacting mine pressureis absorbed. According to the method, on the two edges of a roadway, hole drilling is performed to crack the coal and rock mass, a 6-12 m steel pipe is arranged in drilled holes in a sleeved manner, cracking pressure relief can be repeatedly performed on the coal and rock mass many times through the steel pipe, but a roadway supporting and protecting layer is not damaged; and meanwhile hole drilling is performed in the 6-12 m steel pipe many times to form a weak structural layer, and the energy of the impacting mine pressure is absorbed. According to the method, on the premise that the roadwaysupporting and protecting layer is effectively protected, the energy of the impacting mine pressure can be effectively absorbed, the damage degree to a roadway by the impacting mine pressure is weakened, a great significance is achieved for preventing and treating the impacting mine pressure, repeated hole drilling is a simple and effective coal and rock mass cracking method, very wide application is achieved during roadway pressure relief, and very high practical value is achieved in coal mine.

Description

technical field [0001] The invention relates to the application field of realizing weak structures in coal mine underground tunnels by using pressure relief holes for repeated cracking. In particular, the invention relates to a method for forming a weak anti-scouring structure of the roadway by fracturing coal and rock pressure relief holes in the field of coal mine underground roadway excavation and mining safety technology. Background technique [0002] According to statistics, there have been 178 mines in my country where rock burst (rock burst) has occurred. Rock burst accidents not only occur in deep mines, but also in shallow mines. With the continuous mining of coal resources, rock bursts The number of mine crushing shafts will gradually increase. Once the shock mine crushing occurs, it will cause a great threat to the life of the miners and cause huge losses to the mine. Rock burst is a dynamic phenomenon in which the original mechanical balance of the roadway and wo...

AI Technical Summary

Problems solved by technology

Especially in some mines with severe rock burst, although various prevention and control techniques have been adopted, the disaster of rock burst has not been eliminated.

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