Abstract： During the mining process of fully mechanized mining face in Qincheng Coal Industry, due to the failure of the upper key stratum to fall in time and fully, a cantilever beam structure was formed above the coal pillar of the roadway, resulting in large deformation of the roadway, bottom drum and side drum phenomenon, affecting the safe and normal use of the roadway. In order to solve this problem, through analysis and research, it was decided to carry out hydraulic fracturing roof weakening pressure relief test in the stop line position of No.20106 and 20107 Face, the open-off cut position of No.20107 and 20108 Face, and the return air roadway ( auxiliary air intake roadway ) of No.20107 Face, and relevant fracturing schemes were formulated. Practice showed that after the implementation of the designed pressure relief scheme, the roof could collapse in time, the length of the suspended roof was reduced, the problem of large deformation of the tail roadway and the main roadway was solved, the amount of roadway repair was reduced, which ensured the safety of mining.
