深井煤巷钻孔卸压技术的数值模拟与工业试验

Numerical simulation and industrial test of boreholes destressing technology in deep coal tunnel

结合工程实例,利用数值模拟方法研究了钻孔卸压的作用机理、巷道围岩动态损伤破坏发展和应力场重新分布的过程.模拟发现:合理布置的卸压孔可以导致巷帮围岩的结构性预裂破坏,从而使围岩高应力向深部转移;在卸压孔和锚网联合支护后改善了围岩附近的应力环境,改变了围岩破坏的时空次序,对控制围岩变形和破坏具有突出的优越性.

Based on a engineer samples, used numerical simulation method, the mechanism of the reduction of the stress around tunnel in deep mine after the drilling of boreholes, the development of the dynamic damage and destruction of the surrounding rock-mass, and the redistribution of the stress field around the tunnel were studied. It is found that the rational located destressing boreholes can induce structural failure of the surrounding rock-mass, consequently the high stress move deeply in the rock-mass, and the stress environment in the surrounding rock is ameliorated, the spatio-temporal order of the destruction of the surrounding rock-mass is changed when the destressing boreholes and bolting net with wire mesh composite support are accomplished, therefore the compound supporting technology has prominent advantage for control the deformation and destruction of the surrounding rock.