高应力区陡倾矿体开采引起岩移变形的数值模拟

Numerical Simulation of Rock Mass Movement and Deformation Caused by Mining Steep Mine in High Stress Area

采用数值模拟的方法,就金川二矿区高构造应力下充填开采引起的地表变形规律、围岩位移场展开研究。结果表明:构造应力下充填开采引起的地表变形的形态和范围、变形中心位置和量值均在发生有规律性的变化,矿体上盘的地表变形量明显大于矿体下盘的地表变形量;围岩变形形式由初期的顶板下沉和底臌变成后期的两帮内挤;上盘围岩的位移量大于下盘围岩位移量。研究结果对于研究构造应力下的陡倾矿体开采引起的地表及围岩变形规律有指导意义。

Based on numerical simulation method, the ground movement laws and evolution pattern of displacement field caused by underground backfill mining in high tectonic stress area were studied. The numerical results indicate that the shape, range, central position and magnitude of ground movement are changing regularly caused by backfill mining in high tectonic stress area. The deformation of the ground surface in the hanging wall is obvious larger than that in the foot wall. The surrounding rock deformation form changes from roof convergence and floor heave at an early stage to wall convergence in the later. The magnitude of the displacement in the hanging wall is larger than that in the foot wall. This result is beneficial to the study of the ground surface movement and surrounding deformation caused by backfill mining the steep orebody in high tectonic stress area.