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根据大冶铁矿东露天采场挂帮矿开采的实际情况,建立基于时变力学的数值模型,利用MIDAS/GTS有限元分析软件,模拟并分析了该露天边坡挂帮矿开采的时变规律。模拟结果表明:(1)随着挂帮矿的回采步的推进,回采引起的应力和位移均随之增大,表现出明显的时变规律特征;(2)边坡发生失稳可能性最大的阶段不是在回采的最后一步,而是在第3回采步;(3)F9断层作为主要的软弱结构体,控制着整个边坡的稳定性,需要采取相应的加固措施。
According to the actual situation of hanging pit mining in the open pit of Daye iron mine, a numerical model based on the time-varying mechanics was established. With the use of the MIDAS / GTS finite element analysis software, the time-varying law. The simulation results show that: (1) With the advancing of mining step, the stresses and displacements caused by the mining are both increased and show obvious time-varying regularity characteristics; (2) the slope is most likely to instability Is not the last step in the mining, but the third step; (3) The F9 fault, as the main weak structure, controls the stability of the whole slope and needs to take corresponding reinforcement measures.