A method for prevention and control of coal mine roadway floor type rock burst

Abstract

The invention provides a method for preventing coal mine tunnel floor type rock burst and belongs to the technical field of coal mine safe mining. The method for preventing coal mine tunnel floor typerock burst comprises the following steps that impact-hazard areas of different grades are divided, and prevention areas where rock burst prevention needs to be conducted are determined; a number of drilled holes are formed along the longitudinal direction in two sides of prevention area tunnel floors respectively; explosive charge is conducted in bottom-breaking blasting explosive segment, and blasting is conducted; expansive cement is injected into a first hole-sealing cement segment, and holes are sealed; yellow mud is poured to a yellow mud buffering zone; shearing deformation-resistant components are put into a shearing deformation-resistant component segment; and cement is injected into a second hole-sealing cement segment, and hole are sealed. By means of the method for preventing coal mine tunnel floor type rock burst, continuously increasing stress on bottom coal or soft rocks is lowered; the phenomenon of ultralow friction slippage in bottom coal or soft rock layer is reduced; the risk of occurrence of floor type rock burst is lowered; occurrence of floor rock burst can be effectively prevented; and the prevention effect of rock burst is improved.

Description

technical field [0001] The invention relates to the technical field of coal mine safety mining, in particular to a method for preventing and controlling rock burst in a coal mine roadway floor. Background technique [0002] At present, shallow resources are becoming increasingly depleted, and deep mining is an inevitable trend to ensure energy supply in my country. With the increase of mining depth, geological conditions deteriorate, and the frequency and intensity of rock bursts increase significantly. The commonly used rock burst prevention and relief measures mainly include pressure relief blasting, coal seam water injection, and directional fracturing. achieve the desired purpose. When there is bottom coal left in the roadway or the floor is soft rock, and the indirect bottom is a hard rock layer, the hard rock layer acts as an impact energy transmission belt, which plays a role in the far-field energy transmission from the roadway to the roadway floor, and the far-fiel...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the technical problems existing in the prior art that when there is a hard rock formation under the floor of the roadway, ultra-low friction slippage is very easy to occur, and the bottom coal at the two bottom corners of the roadway is easy to turn over to the middle of the roadway, resulting in serious roadway floor heaving and other technical problems. The invention provides a method for prevention and control of coal mine roadway floor-type rock burst, which reduces the continuously increasing stress on the bottom coal or soft rock, reduces the phenomenon of ultra-low friction slippage in the bottom coal or soft rock layer, and reduces the occurrence of floor-type impact The danger of ground pressure can effectively prevent the occurrence of ground pressure burst and improve the prevention and control effect of ground pressure

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