论文部分内容阅读
根据卡房矿新山矿段的地质条件和生产能力要求的实际情况,基于采矿环境再造连续开采的思想,提出了3种可行的开采顺序优化方案。运用MIDAS/GTS有限元分析软件,建立了复杂矿体的三维有限元模型,模拟并分析了3种不同开采顺序优化方案的力学时变效应。研究结果表明:随着开采的逐步推进,采场的应力和位移不断增大,并出现了明显的应力集中;3种方案中采场周围最大压应力均达到了27 MPa,顶板最大压应力不超过15 MPa,最大拉应力达到了1.2 MPa;顶板最大沉降位移值分别为82.9、84.4、84.5 mm;顶板有较大范围的拉应力区域出现,3种方案拉应力区域面积占顶板面积的比例最大分别达到22%、22.3%和23.5%,但拉应力区域的时变规律表现出显著的不平衡性和突变性。运用采场结构对采动过程响应的时变分析,以拉应力损伤区域和顶板的沉降位移为评价指标,提出方案1的开采顺序为最优方案。
According to the actual conditions of the geological conditions and production capacity requirements of the Xinfang ore section in Kasang Mine, three feasible mining sequence optimization schemes are put forward based on the idea of mining continuous mining. Using the finite element analysis software MIDAS / GTS, the three-dimensional finite element model of the complex orebody was established and the mechanical time-varying effects of three different mining sequence optimization schemes were simulated and analyzed. The results show that with the gradual advancement of mining, the stress and displacement of the stope increase continuously, and obvious stress concentration appears. The maximum compressive stress around the stope in the three schemes reaches 27 MPa, and the maximum compressive stress of the roof is not Above 15 MPa, the maximum tensile stress reached 1.2 MPa. The maximum settlement values of the roof were 82.9, 84.4 and 84.5 mm respectively. The tensile stress of the roof appeared in a wide range. The tensile stress area of the three schemes accounted for the largest proportion of the roof area Respectively, reaching 22%, 22.3% and 23.5% respectively. However, the time-varying laws of tensile stress regions showed significant imbalance and mutation. Using time-varying analysis of stope structure response to mining process, taking the settlement and displacement of tensile damage zone and roof as evaluating indexes, it is proposed that the mining sequence of scheme 1 is the optimal scheme.