Study on reasonable design of filling wall for Y-type ventilation roadway in long wall working face

In order to solve the upper corner gas accumulation problem of a high gas mine, a reasonable parameter design of the filling wall of Y-type ventilation roadway was studied by the comprehensive methods of engineering investigation, laboratory experiment, refinement numerical simulation and in-situ test. The results show that the uniaxial compressive strength of the standard specimen made by filling material can be reached 89% of the final strength when the curing time is 10 days; the refinement three-dimensional model with different constitutive equations for gob, filling wall, coal and rock mass is more accurate; when the width of filling wall is 2.5 m, the axial stress of bolt and cable, convergence, plastic zone of surrounding rock are under reasonable control; the cross section of roadway is larger than 9.0 m2, and the bearing capacity of the filling wall are reasonable during the in-situ test period. It is concluded that the reasonable size design of filling wall is 2.5 m, and the research method can provide guidance for other mines with similar conditions.