Prevention and control method of rock burst during mining in working face in fault zone

Abstract

The invention discloses a method for preventing and controlling rockburst during mining of a working face in a fault area. Within the range, construct a row of energy release holes into the coal seam; when the working face advances to the start position of the energy release holes, if it is found that there is still a risk of impact between the energy release holes, mining should be stopped, and then go to the coal seam along the roadway in the mining area. Construct a row of pressure-relief blast holes to release energy after detonation, so as to eliminate the risk of rock burst in the fault area, so that the working face can safely pass through the fault area. The invention can realize safe mining in the fault area and deep rockburst mine wells. According to the situation, the pressure is released in two steps to reduce the workload and save the production cost.

Description

technical field [0001] The invention belongs to the technical field of coal mining. Background technique [0002] Rock burst is one of the major disasters in my country's coal mines. Most of the rock bursts are closely related to geological conditions. The rock bursts in geological structure areas account for more than 60% of the total, and generally occur in faults, folds and other parts. With the increase of mining depth, rock burst in the fault area occurs from time to time, and the impact intensity also increases with the depth. The impact disaster in the fault area has seriously restricted the safe production of coal mines in our country. Practice has proved that when the roadway is excavated into the fault-affected area or the working face advances to the fault-affected area, because the rock strata in the fault area are relatively broken and soft, the surrounding roadway is dominated by broken coal rocks, the stress distribution is complex, and the impact risk of coal...

AI Technical Summary

Problems solved by technology

Practice has proved that when the roadway is excavated into the fault-affected area or the working face advances to the fault-affected area, because the rock strata in the fault area are relatively broken and soft, the surrounding roadway is dominated by broken coal rocks, the stress distribution is complex, and the impact risk of coal seams is strong. Rockburst will occur under disturbance conditions in mining engineering. This type of rockburst is highly concealed. When rockburst occurs, it will be accompanied by secondary disasters such as roof caving, which will cause coal and rock to fall suddenly. It is extremely difficult to prevent. Once the coal rock suddenly falls, it is difficult to support

The prevention and control of rock burst in this fault area is different from conventional methods, and it is difficult to achieve effective control by conventional methods

Due to the difference of the coal (rock) mass in the fault zone from broken to cracked, the coal seam at the two sides of the roadway is a transitional medium, and it is difficult to achieve effective prevention and control by conventional measures

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