Rock burst underground prevention and control method for coal seam groups

Abstract

The invention relates to a rock burst underground prevention and control method for coal seam groups. The coal seam groups are divided into a plurality of groups, the uppermost part of each group is a thin coal seam, the coal seams are sequentially mined from top to bottom, the coal seam of the next layer is directly mined by utilizing the pressure relief effect generated by mining of the thin coal seam, and the process is circulated. Top plate cracking and drilling are upwards constructed in a mining roadway of the thin coal seam to crack the upper part of the coal seam group and thick hard rock layers among the coal seam groups, and pressure relief and extraction integrated holes are downwards constructed to crack and relieve the pressure of the coal seam of the next layer and pre-extract gas. The thin coal seam adopts a spiral drilling and mining process, so that the danger caused by rock burst is greatly reduced, and a rock burst buffer layer is formed by blasting coal pillars through directional blasting and drilling after spiral drilling and mining. According to the method, all pressure relief and gas extraction work is concentrated in the thin coal seam at the uppermost part, especially in the mining roadway of the thin coal seam at the uppermost part, one roadway has four purposes, and the integration degree is high.

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 ...

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