关键词: 大采高工作面, 复杂应力, 切顶卸压, 水力压裂, 沿空留巷

Abstract: In view of the difficulty to leave the roadway under complex stress disturbance for 3 # coal mining height working face in Sihe mine, and the serious deformation of surrounding rock of roadway multiplexing at the airport side, Hydraulic fracturing technology is adopted to conduct directional pre-cracking on key strata of roadway roof, and the cantilever beam above the coal pillar on the face side of the roadway is cut off, so as to reduce the overhanging load of the cantilever beam and the rotary deformation force, so as to cut off or greatly weaken the load transferred from the rock beam to the coal pillar protecting the roadway and the remaining roadway, and fundamentally improve the mechanical environment of the roadway. The results show that the application of hydraulic fracturing in cutting off the top of the roadway can effectively improve the stress state of the surrounding rock, control the deformation of the surrounding rock, avoid the secondary or multiple repair of the roadway, and reduce the support difficulty and cost of the roadway.