Method for preventing and controlling rock burst through energy release modification of deep well high-stress main roadway coal pillar

Abstract

The invention provides a method for preventing and controlling rock burst through energy release modification of a deep well high-stress main roadway coal pillar, and belongs to the technical field ofmining. The method comprises the following steps: firstly, large-diameter pressure relief drilling is implemented, to release accumulated elastic energy of a coal mass; secondly, ultrahigh-pressure fixed-point hydraulic fracturing is carried out in the large-diameter drill hole, the complete coal pillar is cracked, and the energy storage capacity of the main roadway coal pillar is weakened; then,grouting reinforcement is carried out on the fractured main roadway coal pillar, the strength of the main roadway coal pillar is improved, and the impact threshold value is increased; and finally, reinforcing support is implemented, and the impact resistance of the main roadway coal pillar is improved. According to the method, the elastic energy accumulated by the main roadway coal pillar is released, the physical and mechanical properties of the main roadway coal pillar are changed, the impact threshold of the main roadway coal pillar is improved, the elastic energy accumulated by the high-stress main roadway coal pillar can be effectively reduced, and the problem that after pressure relief of the main roadway coal pillar, the strength is reduced, and surrounding rock large deformation is likely to happen is solved.

Description

technical field [0001] The invention relates to the technical field of mining, in particular to a method for preventing rock burst by energy release modification of coal pillars in high-stress roadways in deep wells. Background technique [0002] With the continuous increase in the depth and intensity of coal mine mining in my country, the areas, mines, and impact times of rock burst disasters have increased rapidly, which has become increasingly harmful to coal mine safety and production, and has become the key to coal mine production in some areas of our country. one of the problems. In particular, the upper and lower lanes have a long service life and a large traffic volume, which is particularly important for the protection of the coal pillars in the lanes. [0003] The purpose of the coal pillar in the roadway is to ensure the normal use of several roadways. The existing methods for the prevention and control of rock burst in the coal pillar of the roadway are generally...

AI Technical Summary

Problems solved by technology

This method is complex for the construction of the entire roadway coal pillar, and the requirements for the anchor cable material are high, and the coal pillar is easy to accumulate a large amount of elastic energy.

[0004] The present invention proposes a method in which coal pillars in the roadway are subjected to large-diameter pressure-relieving drilling and strong powder discharge treatment, and then ultra-high pressure fixed-point hydraulic fracturing of the coal body is performed, and cement mortar is used to fill the fracturing cracks and carry out reinforcement and support, which is effective. Reduce the elastic energy accumulated in high-stress large roadway coal pillars, and at the same time solve the problem that the strength of the large roadway coal pillars is reduced and prone to large deformation of the surrounding rock after pressure relief

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