基于数值模拟的复杂采空区稳定性分析

Stability Analysis on the Complicated Goaf Based on the Numerical Simulation

在详细调查某矿山复杂采空区空间形态和分布情况的基础上,利用软件耦合技术建立了采空区的三维数值模型,并采用FLAC3D对采空区稳定性进行了模拟计算。根据模拟结果对围岩的应力、位移和塑性区的分布规律进行了深入研究。结果表明:采空区角隅处出现明显的应力集中且发生剪切破坏,顶板中央区域有较大的拉应力产生;围岩产生向空区的变形,最大变形位于采空区顶底板;相邻采空区围岩应力和位移出现叠加,表现出采空区的"群效应",这些区域围岩的应力和位移相对较大,是容易产生破坏的区域。总体而言,采空区目前处于稳定状态,建议矿山充填采空区以控制围岩变形。

Based on the detail survey of spatial shape and distribution of complicated goaf in a mine, the 3D numerical model of goaf was established by the coupling technology of software. The stability of goal was simulated by FLAC3D. According to the simulation results, the distribution laws of stress, displacement and plastic zone in surrounding rock were thoroughly studied. The results showed that the stress concentration and shear failure obviously appeared in the corner of goaf, and the large tensile stress presented in the middle area of roof. The deformation producing in surrounding rock turned towards the goal, and the maximum deformation appeared in the roof and floor of goaf. The stress and displacement in the surrounding rock of adjacent goals overlaid, which showed the group effect of goal. Moreover, the overlaid area had large stress and displacement in surrounding rock and was easy to be damaged. In general, the goal is stable at present, and it is suggested that the goaf should be treated by filling method to control the deformation of surrounding rock.