Technology of Advanced Pre-grouting Reinforcement in Tailentry of Fully-mechanized Caving Coal Face

Due to the tailgate surrounding rock near terminal line was difficult to be controlled caused by strong mining influence, this paper focused on the charact eristics that the No.2305 coal face tailgate near terminal line repeatedly affected by pressure in Zhangcun Coal Mine, large displacement affected the safe withdrawl of hydraulic supports.The factors of damage were given, this paper analysed the influence sphere of the driving dynamic pressure, the impact of the advanced abutment st ress at adjacent coal face, the lateral abutment stress in the goaf and the abutment stress in coal face based on numerical simulation, and proposed grouting reinforce ment measures.The results showed that technology of advanced pre-grouting reinforcement made two sidewalls convergence reduced by 1 206 mm and roof-to-floor co nvergence reduced by 535 m.