基于实测的复杂采空区稳定性分析

Stability of mined-out cavity based on actual measurement

结合某铁矿采空区的实际情况,采用空区三维激光探测系统对采空区进行了探测,准确掌握了采空区的三维形态和空间位置,为采空区稳定性数值模拟分析奠定了基础。并运用3DMine软件建立采空区三维模型和矿区地学三维模型,提出采用数据转换的耦合模式将3DMine与Flac3D耦合构建数值计算模型进行数值模拟计算,根据模拟计算结果对采空区的围岩稳定性进行了分析,结果表明,矿体被开挖以后,由于围岩应力重分布,空区顶板及侧壁围岩处于较明显的拉应力状态,空区围岩位移以顶板Z向位移为主,矿柱侧向位移不明显,但空区围岩的塑性分布范围较广,主要集中在空区的顶板及底板,而矿柱顶部的塑性分布将会导致矿柱塑性变形失稳,对所测采空区的稳定性产生很大的影响。

The basic components, principle and monitoring way of CMS are introduced. The key to the cavity stability numerical simulation is to grasp the shape, size of cavity, on the basis of the actual situa- tion of iron mine, the cavity model and geological model of the mine are constructed by using 3DMine software based on CMS. A method of constructing numerical computing model with the coupling of 3DMine and Flac3D is put forward. The simulation calculation is carried out. The stability of surrounding rock of the cavity is analyzed according to the simulation calculation results. Results indicates that the cavity roof and wall rock is in more apparent tensile stress state with the reason of the redistribution of surrounding rock stress after excavation. The roof central displacements are larger than the pillar lateral displacements ,plastic zones are distributed to varying degrees in the cavity roof,floor and pillars,espe- cially distributed in the pillars, showing that the cavity surrounding rock is in poor stability and the cavi- ty is in instability.