Rock burst preventing method for blast and injection of water-coupled softened coal body

Abstract

The invention discloses a rock burst preventing method for a blast and injection of water-coupled softened coal body, and is suitable for rock burst disaster prevention of coal mining, and in particular to rock burst prevention of a tight and hard coal bed which is hard to inject water to soften. The method disclosed by the invention comprises the following steps: firstly, constructing water injection holes and blast holes in a coal wall of a lane, wherein the water injection holes and the blast holes are alternately formed, that is, the blast holes are formed between two adjacent water injection holes; then performing loose blasting on the coal body through the blast holes to relieve the pressure of the coal body and form blast gaps in the coal body; and then injecting water into the coal body in the water injection holes to soften the coal body. Gaps are distributed by taking the blast holes as the center in coal body blast, so that the water injection property of the coal body is increased. After blast, the coal body is injected with water, so that the water injection resistance is reduced and the water injection rate is increased; the coal bed which is originally hard to inject water, or even is hardly injected with water to soften, is injected with water to soften, so that the rock burst disaster is effectively prevented. The method is simple to operate, safe and practical and good in pressure relieving effect.

Description

technical field [0001] The invention relates to a method for preventing and controlling rock burst in a coal mining face of a coal mine, in particular to a method for preventing and controlling rock shock by coupling softening coal body with blasting and water injection. Background technique [0002] Rock burst is a coal-rock dynamic disaster in which the elastic deformation energy accumulated by the coal-rock mass under high stress exceeds the strength of the coal-rock mass, and the energy is released instantaneously, causing roadway damage, mechanical and electrical equipment damage, and even casualties. It is one of the main disasters of mining, which seriously affects the safe and efficient production of mines. [0003] With the deepening of mine mining depth, the increase of mining intensity, and the complexity of mining layout, the stress conditions of the mining surrounding rock gradually deteriorate, and the resulting rock burst disasters increase sharply and intensi...

AI Technical Summary

Problems solved by technology

However, for the impact-prone coal seam, the coal body has high strength and low permeability, and it is difficult to inject enough water by conventional water injection methods, and the ideal water injection effect cannot be achieved.

At present, coal seam water injection has a better application effect in weak coal bodies with relatively developed joints and fissures. For hard coal bodies with insufficient joints and fissures, coal seam water injection cannot achieve sufficient pressure relief effect, while hard coal seams with low permeability and high strength often The risk of impact is higher, and the possibility of mine pressure disaster is greater

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