Multi-coal-seam rock burst prevention and control method for ground drilling pressure relief

Abstract

The invention relates to a multi-coal-seam rock burst prevention and control method for ground drilling pressure relief. Firstly, coal drawing pressure relief of an uppermost coal seam is conducted through construction ground coal drawing directional drilling, elastic energy accumulation is prevented, and effective pressure relief is formed for tunneling of a roadway and stoping of a working face. Furthermore, a thick and hard rock stratum in whole overlying rock is subjected to horizontal layered fracturing through ground hydraulic fracturing, the rock stratum induced rock burst problem is solved, meanwhile, roof rock stratums on the two sides of the haulage roadway can be cut off through roof cutting work, that is, the working face to be stoped is separated from an area which is not stoped, and overlying rock stratum force of the area which is not stoped is prevented from acting on the working face to be stoped. In addition, the crushing and swelling amount is effectively increased through manual construction of a horizontal fracturing and swelling layer, supporting of the overlying rock stratum is increased, and sinking of the overlying stratum is reduced. Pressure relief of a mining protection layer is generated on a next coal seam through mining of the upper coal seam, and a foundation is provided for tunneling and stoping of the next coal seam.

Description

technical field [0001] The invention relates to the field of rock burst in coal mines, in particular to a multi-coal seam rock burst prevention and control method for ground drilling and pressure relief. Background technique [0002] Rockburst refers to the dynamic phenomenon of sudden and violent destruction of the coal and rock mass around the coal mine shaft or working face due to the instantaneous release of elastic deformation energy, often accompanied by instantaneous displacement, throwing, loud noise and air waves of the coal and rock mass. etc., which may easily cause injury to coal mine personnel. Generally speaking, the existence of thick and hard rock formations in the overlying rock is an important factor for rock bursts. Due to the existence of thick and hard rock formations, it is difficult to break and the fracture distance is large, so that the pressure release is large at one time when it breaks, causing a huge impact. In this regard, the existing technolo...

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Problems solved by technology

In this regard, the existing technologies are mostly treated by a single method of roof cutting and pressure relief or surface hydraulic fracturing, and the specific roof cutting methods and hydraulic fracturing schemes are various; roof cutting and pressure relief are generally carried out in two lanes of the working face. Therefore, the top cutting height is limited, and the effect of this method is not ideal if there is a thick and hard rock formation at a higher place; hydraulic fracturing is generally affected by the construction layer and the effect of fracturing into horizontal and vertical cracks. It is difficult to find a quick remedial pressure relief method during subsequent coal mining, resulting in coal mining interruption

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