Effect Analysis on Pressure Relief for Protective Seam Mining of Thin Coal Seam in High-gas Coal Seam Group

Aiming at the problem of safe and efficient mining for high-gas and close distance coal seam group in the north wing of Shaqu Coal Mine, the pressure relief mechanism of protective seam mining of thin coal seam under close distance coal seam group was analyzed by using the method of combining numerical simulation with theory analysis, then the protective seam mining of 2^# thin coal seam was put forward. Based on the actual situation of 22201 first mining protective seam working face, then pressure relief protection scope of protective seam mining of thin coal seam for the close protected coal seam below was analyzed, and determined the amount of liberation coal for the protective seam mining. The field test results showed that effect of pressure relief was obvious by the protective seam mining for 2^# thin coal seam, and the effect of gas pre-drainage for protected coal seam was improved greatly.