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Downhole prevention and control method of rock burst in a coal seam group

A technology of rock burst and coal seam group, which is applied in underground mining, surface mining, earth drilling and mining, etc., and can solve problems such as gas outburst

Active Publication Date: 2022-01-14
CHINA COAL RES INST
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AI Technical Summary

Problems solved by technology

Ground construction drilling for hydraulic fracturing is one of the most commonly used methods for rock burst prevention and control. However, in many cases, the ideal drilling location is often not suitable for construction on the ground. Due to the influence of equipment movement and water sources, some terrain conditions may not even be available at all. With ground drilling construction conditions, it is a challenge to only carry out underground rock burst prevention and control under the conditions of coal seam group mining, and rock burst conditions are often accompanied by gas outbursts, which is also a problem that needs to be solved urgently

Method used

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Embodiment Construction

[0022] A method for underground prevention and control of rock burst in a coal seam group, comprising the following steps:

[0023] S1, the coal seam group is divided into multiple coal seam groups from top to bottom, each coal seam group contains multiple coal seams, the uppermost coal seam in the coal seam group is a thin coal seam, and the coal seam in the coal seam group constitutes a short-distance coal seam, said The short-distance coal seam requires that the coal seam of the upper layer in the coal seam group can at least have a pressure relief effect on the coal seam of the lower layer after mining;

[0024] S2, in the coal seam group as a whole, the mining of each coal seam group is carried out sequentially from top to bottom; within the coal seam group, the mining of each coal seam is carried out sequentially from top to bottom, that is, the uppermost thin coal seam is mined first in the coal seam group;

[0025] S3, in the uppermost thin coal seam in the coal seam g...

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Abstract

The present invention relates to a method for preventing and controlling the underground pressure of coal seam groups. The coal seam of the next layer is directly mined, and so on. In the mining roadway of the thin coal seam, the roof fracturing hole is constructed upward to fracturing the upper part of the coal seam group and the thick hard rock layers between the coal seam groups, and the pressure relief and drainage integrated hole is constructed downward to depressurize the next layer of coal seam. Pre-pump the gas. The thin coal seam adopts the auger drilling technology to greatly reduce the danger caused by the rockburst. After the auger mining, the coal pillars are blasted by directional blasting to form the rockburst buffer layer. The invention concentrates all pressure relief and gas extraction work in the uppermost thin coal seam, especially in the mining roadway of the uppermost thin coal seam, with one roadway for four purposes and a high degree of integration.

Description

technical field [0001] The invention relates to the field of rock burst in coal mining, in particular to an underground prevention method for rock burst of coal seam groups. Background technique [0002] Coal is one of the main energy sources in my country. However, with the increase of coal mining life, the mine will enter the deep development stage. With the increase of mining depth, the frequency and intensity of underground dynamic disasters represented by rock burst gradually increase. Coal mine rock burst is a dynamic disaster phenomenon in which the accumulated elastic energy is released instantaneously due to the instability and damage of coal and rock mass during the mining process. Ground construction drilling for hydraulic fracturing is one of the most commonly used methods for rock burst prevention and control. However, in many cases, the ideal drilling location is often not suitable for construction on the ground. Due to the influence of equipment movement and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21C41/18E21F7/00
CPCE21C41/18E21F7/00
Inventor 杨冠宇李海涛李春元郑伟钰王美美
Owner CHINA COAL RES INST
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