Method for treating rock burst through thick-layer hard roof modified pressure relief source

Abstract

The invention provides a method for treating rock burst through a thick-layer hard roof modified pressure relief source. The method comprises the steps of target rock stratum determination, fracturingrange determination, horizontal well position determination, well drilling, high-pressure hydraulic directional fracturing, and roadway layout optimization. According to the method for treating the rock burst through the thick-layer hard roof modified pressure relief source, a stress concentration degree in a coal mining period can be remarkably reduced, the coal stress is made to be always underthe critical stress for generation of rock burst, and the serious rock burst hidden danger caused by sudden breakage of a large-area roof is fundamentally eliminated.

Description

technical field [0001] The invention relates to the technical field of coal mine safety mining, in particular to a method for controlling rock burst by modifying a pressure relief source with a thick-layer hard roof. Background technique [0002] According to statistics, from 2006 to 2018, more than 80% of rock burst accidents in my country occurred in coal seam roadways with thick and hard roofs. Especially in the Shendong, Shanbei and Huanglong bases in Northwest my country, there are mostly 50-100m thick hard roofs above 60m above the coal seam. This area is an important strategic base for coal production and storage in my country. The current proven reserves are nearly 445.2 billion tons, accounting for about 31% of the country's proven reserves; 33.8% of the yield. Regardless of resource reserves or mining intensity, it is the largest area in the country. Due to the existence of a thick and hard roof, the overhang area is large during the mining process, resulting in ...

AI Technical Summary

Problems solved by technology

Due to the existence of a thick and hard roof, the overhang area is large during the mining process, resulting in local stress concentration, and its sudden fracture releases a strong dynamic load instantly, which is very likely to cause a vicious rock burst accident that causes mass death and mass injury, and even spreads to the surface, causing The ground shakes violently, causing great harm

However, because the hard roof is far away from the coal seam and has a large thickness, it is extremely difficult to deal with and the input cost is high. The pressure relief measures currently used, such as roof blasting and hydraulic fracturing, are all located in the tunnels and chambers of coal mines. It can perform local pre-cracking on low-level roof strata in a small area. For high-level thick-layer hard roofs, the above method is still difficult to achieve large-scale treatment, which is one of the important reasons for frequent occurrence of rock burst accidents

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