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本文介绍用二维有限元的应力分析方法,研究锡矿山南矿河床八九中段采场上复岩层的应力分布状态和直接顶板岩层的稳定性.计算中所采用的岩石物理力学性质是采用实验室测定的结果.在计算过程中,首先求解开采前岩体的重力应力场,然后再求出开采过程所引起的采场上部的应力分布状态,最后引入一个安全系数概念评价直接顶板的稳定性;提出了安全开采跨度和开采对顶板岩层应力场的扰动范围.
In this paper, the stress analysis of two-dimensional finite element method is used to study the stress distribution and the stability of the direct roof strata of the upper strata in the middle and middle reaches of the No. 89 mine in the Ximuanshannan Mine. The physical and mechanical properties of the rock used in the calculation are calculated by experiment In the calculation process, firstly, the gravitational stress field of the rock mass before mining is solved, and then the stress distribution in the upper part of the stope caused by the mining process is determined. Finally, a safety factor concept is introduced to evaluate the stability of the direct roof The range of safe mining span and the perturbation range of stress field of roof strata during mining are put forward.