Method for preventing and controlling impact ground pressure

Abstract

The invention relates to the field of prevention and control of impact ground pressure in a coal mine and provides a method for preventing and controlling the impact ground pressure. The method comprises the following steps: forming a sampling hole in the surface; carrying out sampling on all rock layers by the sampling hole to obtain position information of all key layers; carrying out coal mining along the propelling direction of a working face; before periodic weighting on the working face, forming a grouting hole extending to the grouting position in the ground, wherein the grouting position is the position of a separation layer between an inferior key layer close to a roof and a weak layer under the inferior key layer; utilizing a high-pressure pump to grout pre-mixed coal ash slurryinto the separation layer corresponding to the grouting layer through the grouting hole. The method provided by the invention has the beneficial effects that before periodic weighting on the working face, the grouting hole is formed in the surface to carry out high-pressure grouting, the roof falls during mining and grouting under the action of self-gravity stress of high-pressure coal ash slurryand rock stratums, so that in-time and effective release of breaking energy of the roof is ensured, the inducing factors of the impact ground pressure are reduced and the stress concentration is avoided.

Description

technical field [0001] The invention relates to the field of preventing and controlling low pressure in coal mines, in particular to a method for preventing and controlling rock burst. Background technique [0002] At present, in the process of coal mining in my country's coal mines, it often occurs that the hard roof is suspended in a large area, resulting in the phenomenon that the periodic pressure is not obvious. When the advancing distance of the working face reaches a certain value, the overhanging span of the roof has reached its limit breaking distance. At this time, the hard roof is very easy to break suddenly in a large area under the joint action of its own gravity and the pressure of the overlying rock formation, which will lead to violent movement of the rock formation in the stope collapse zone, resulting in impact low pressure, which greatly threatens the safe production of the mine. Contents of the invention [0003] The object of the present invention is ...

AI Technical Summary

Problems solved by technology

At this time, the hard roof is very easy to suddenly break in a large area under the joint action of its own gravity and the pressure of the overlying rock formation, which will lead to violent movement of the rock formation in the stope collapse zone, resulting in impact low pressure, which greatly threatens the safe production of the mine.

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