孤岛面小煤柱沿空巷道稳定性研究

针对煤矿孤岛面沿空巷道在采矿动压的作用下巷道围岩出现大变形或小煤柱失稳的现象，通过数值计算、物理模拟实验、现场工业性试验等方法对孤岛面小煤柱沿空巷道稳定性进行了系统的研究．研究表明：留设煤柱的宽度对孤岛面沿空巷道的应力分布有较大影响；合适的煤柱宽度，可以使小煤柱位于上覆岩层形成的砌体结构的中部，煤柱上的应力由于变形卸压作用明显降低，巷道实体煤处于砌体梁的高位支撑点，利用覆岩结构有效控制孤岛面小煤柱沿空巷道的表面位移；由于采空区侧没有支承，顶板以实体煤为轴旋转下沉，煤壁受到了垂直巷道轴向、以实体煤为支点的力矩作用，左右煤帮主要产生剪切变形．

Research on Stability of Gob-Side Entry with Small Coal Pillar on Insular Face

Aimed at the severe deformation of surrounding rock of gob-side entry on insular face or the unstable of small coal pillar induced by dynamic pressure in mining,the stability of the gob-side entry with small coal pillar on insular face was studied by numerical calculation,physical simulation experiment and in-situ test.The results indicate that the width of coal pillar has a great influence on the stress distribution of the gob-side entry.The rational width of coal pillar can make the small coal pillar lie in the middle of the masonry structure formed from the overlaying strata,so that the stress of coal pillar can decrease obviously due to the pressure-relief effect.And the integrated coal of roadway is at the high-level support point and the overburden structure is utilized to control the surface displacement of the gob-side entry with small coal pillar on insular face.On account of no support in goaf,the roof circumrotates around the integrated coal body and sinks,and the coal wall is forced by the torque,which is perpendicular to the axes of the roadway with the integrated coal as fulcrum.And the shear deformation appears in two sides of the coal roadway.