营兴煤矿围岩地质力学测试与支护方案优化研究OA

To obtain regional geomechanical parameters of the Yingxing coal mine,and to optimize the roadway support design in the mining area,hydraulic fracturing was used to measure the geostress of the west wing intake airway for gas drainage of No.14 roadway(the 4th roadway in No.1 mining area).At the same time,the acoustic wave method was employed to investigate the variation patterns of wave velocity in the surrounding rock at different depths within the intake drift and the 13304 working face haulage drift.In addition,the structural characteristics of the surrounding rock at various depths were investigated used a borehole camera.The results indicate that horizontal stress exerts a significant directional influence on the excavation of the west wing intake airway for gas drainage of No.14 roadway.The loosening zones in the roof,left wall,and right wall of the west wing intake airway for gas drainage of No.14 roadway are measured as 1.62 m,1.69 m,and 1.50 m,respectively.In the 13304 working face haulage roadway,the loosening zones are 0.94 m,0.80 m,and 1.60 m,respectively.Based on the mechanical properties of coal and rock in the mining area,an optimized support scheme is proposed for the 13304 haulage roadway.The roof is supported by a combined system of rock bolts,cables,steel belts,and steel mesh,while the roadway walls are reinforced using rock bolts and steel mesh.Detailed support parameters for the roof and sidewalls are determined through theoretical calculations.These findings can serve as a reference for surrounding rock control and support design in similar underground coal mining operations.