Load migration impact mine pressure prevention and control method for ground fracturing thick and hard rock stratum

Abstract

The invention relates to a load migration impact mine pressure prevention and control method for a ground fracturing thick and hard rock stratum. The method comprises the steps that firstly, the thick and hard rock stratum in overlying strata is divided into multiple layers of thin rock stratums, after stoping, the thick and hard rock stratum can be bent and sink integrally, the beam forming phenomenon is avoided, coal in a mining area is not subjected to stress concentration any more, and inducements generated by impact mine pressure are solved from the far field range. As cooperation, roof rock stratums on the two sides of a haulage roadway can be cut off through roof cutting work near a stope, and stress concentration generated by suspended roof is reduced; the crushing and swelling amount is effectively increased through manual construction of a horizontal fracturing and swelling layer, supporting on the overlying strata is increased, and sinking of the overlying strata is reduced; and the coal is fractured through construction of a horizontal fracturing and pressure relief drill hole, the coal is prevented from being elastic, the three-in-one cooperation anti-impact effect is good, and the method is particularly suitable for a deep-buried coal seam. In addition, for the construction scheme, a corresponding three-roadway arrangement scheme is creatively provided.

Description

technical field [0001] The invention relates to the field of rock burst in coal mines, in particular to a method for preventing and controlling rock burst by load migration of ground fracturing thick and hard rock layers. 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...

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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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