Study on support technology of equipment removal channel in fully-mechanizedtop coal caving face in ultra-thick seam

According to the problem of surrounding rock supporting and stability of equipment remove gateway in ultra-thick seam fully-mechanized caving faces in Suancigou Mine, the deformation and failure characteristics of the surrounding rock of equipment remove gateway are analyzed by field measurements and numerical simulation, the combined supporting technology of cable anchor in equipment remove gateway is put forward. The result shows that when the distance is 30 m between working face and equipment remove gateway, plastic collapse of surrounding rock begins to increase, when the distance is 10 m between working face and equipment remove gateway, plastic collapse of surrounding rock is severe, after working face is connected with equipment remove gateway, the depth of plastic zone of roof reaches 7 m, roof near the coal wall is deeper, the depth of plastic zone of coal pillar is 3.5 m. According to the deformation and failure characteristics of surrounding rock of equipment removal channel, adhering to the principle of controlling "roof and pillar ", the combined supporting technology of cable anchor is used. This technology has been successfully applied in No.6up-109 equipment remove gateway, the equipment has been successfully withdrawn.