A Ground Burst Prevention and Control Method for Coal Seam Groups in Close Distance

Abstract

The invention relates to a method for prevention and control of rockburst ground in a short distance coal seam group, which divides the near coal seam group into the lowest thin coal seam, the lower coal seam group and the upper coal seam group. First of all, the lowest thin coal seam is mined by auger drilling technology to reduce the risk caused by rock burst, and it is creatively proposed to construct coal digging directional drilling along the axial direction of the mining roadway for coal digging and pressure relief, so as to prevent the occurrence of rock burst during roadway excavation. shock. The lower coal seam group is exploited sequentially from top to bottom and the upper coal seam group is mined sequentially from bottom to top by utilizing the pressure relief effect produced by the mining of the lowest thin coal seam. Hydraulic fracturing drilling is used to crack the thick and hard rock stratum in the upper overlying rock of the close coal seam group to solve the possibility of rock burst caused by the thick and hard rock stratum. The pressure relief work in the coal seam group is to use the pressure relief produced by the mining of the previous coal seam In addition, hydraulic fracturing boreholes are also used as gas drainage boreholes during the mining of coal seam groups, and one hole is used for two purposes; in addition, the mining roadway for the lowest thin coal seam is also used for one roadway and two purposes.

Description

technical field [0001] The invention relates to the field of rock burst in coal mining, in particular to a method for preventing and controlling rock burst ground in close-distance coal seam groups. Background technique [0002] With the increase of coal mining life, the mine will enter the deep development stage, and with the increase of mining depth, the frequency and intensity of underground dynamic disasters represented by rock burst will 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. Roof cutting and pressure relief, downhole drilling and fracturing (thick and hard rock formations and coal seams), and filling mining are the most commonly used rock burst prevention methods, but roof cutting and downhole drilling and fracturing need to be drilled underground, and the construction location It is g...

AI Technical Summary

Problems solved by technology

Roof cutting and pressure relief, downhole drilling and fracturing (thick and hard rock formations and coal seams), and filling mining are the most commonly used rock burst prevention methods, but roof cutting and downhole drilling and fracturing need to be drilled underground, and the construction location It is generally located in the mining roadway, so the construction space is limited, resulting in limited use of construction equipment, the number of drilling operations, the intensity and distance of fracturing are affected, and the drilling of underground construction is likely to conflict with other conventional coal mining work , and filling mining has the problem of high cost; therefore, under the mining conditions of coal seam groups, how to only prevent and control rock burst on the ground is a challenge, and the problem of gas outburst is often accompanied by rock burst conditions, which also urgently need to be solved together The problem