Application of Pressure Relief and Permeability Increasing Technology with Rotating Slice Cutting Through Seam in Jiulishan Coal Mine

Aiming at the problems of coal and gas outburst in Jiulishan Coal Mine of Coking Coal Group, it analyzed the field data deeply, and then proposed the pressure relief and antireflection technology of rotating slice cutting through seam to improve the effects of gas drainage, which could shorten the gas drainage compliance time. The field application showed that after the implementation of pressure relief and antireflection technology, the effective drainage radius increased by 1.6 to 2 times, the coal seam permeability coefficient increased by 24 times, the drainage concentration increased by 2.67 times. In the extraction period of 40 days, the amount of slotted drainage holes was 2.33 times of the amount of normal holes; the drainage compliance time was shortened by 57.1% under the same extraction conditions.