Method for preventing and treating rock burst during exploiting of working face in fault zone

Abstract

The invention discloses a method for preventing and treating rock burst during exploiting of a working face in a fault zone. The method includes the steps that after a mining area roadway is constructed and before the working face is exploited, the two sides of the fault zone in the mining area roadway are each provided with a row of energy release holes towards coal seams within the scopes 100 m away from fault surfaces; when the working face is advanced to the starting positions of the energy release holes, exploiting needs to be stopped if it is found that impact risks still exist between the energy release holes, a row of pressure release blastholes is constructed towards each coal seam along the mining area roadway, energy is released again after detonation, and therefore risks of the rock burst of the fault zone are accordingly eliminated, and the working face can safely pass through the fault zone. According to the method, as for the fault zone and a deep rock burst mine, safe exploiting of the fault zone can be achieved; and pressure release is achieved through two steps according to the conditions, the workload is reduced, and the production cost is saved.

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

Images