Method for rock burst government from pressure relief source of ground fracturing area

Abstract

The invention provides a method for rock burst government from a pressure relief source of a ground fracturing area. The method comprises the steps that a target rock stratum in need of modified pressure relief in an area with a hidden danger of rock burst is determined; a well spacing mode of a fracturing well is determined in the target rock stratum, and well drilling is conducted; the fracturing well comprises a horizontal well or a vertical well; and oriented fracturing is conducted on the fracturing well after drilling. The method for rock burst government from the pressure relief sourceof the ground fracturing area has the beneficial effects that a stress centralization degree during coal mining can be significantly reduced, so coal mass stress is kept under a critical stress for rock burst occurrence and thus a serious rock burst hidden danger caused by sudden fracturing of a large-area top plate can be eliminated fundamentally. The method belongs to a strategic governance measure of rock burst, is of great significance for progress in technologies and concepts of prevention and control of rock burst in China and has significant social and economic benefits.

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 at the source of pressure relief in a ground fracturing area. 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 local ...

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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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