In order to obtain the rational stope structure parameters and realize safe and efficient mining of level afterwards back-filling approach with medium-deep hole caving in Wangershan Gold mine. The changing relationship between stress and thickness of roof under different spans was analyzed by using the thin elastic theory, the rational range of excavating was determined. Combined with the actual mining condition, through the central composite test design, mechanical responses under different structural parameters were obtained by numerical simulation. Based on the second order response surface method, the regression models of the maximum tensile stress, the maximum compressive stress and the maximum vertical displacement were established and regarded as objective functions, the Pareto optimal solution set was obtained by genetic algorithm multi-objective optimization. The results show that according to engineering needs, the optimal parameters are as follows: the chamber span is 26.0 m, the pillar span is 28.0 m, and the roof thickness is 6.7 m.%为获得合理采场结构参数,实现山东莱州望儿山金矿中深孔阶段崩矿嗣后充填法的安全高效开采,采用弹性薄板理论,分析不同跨度下顶板应力与厚度的关系,确定合理的开采参数范围;结合矿山实际开采条件,通过中心复合试验设计,采用数值模拟计算得到不同结构参数下的力学响应;基于二阶响应面法建立最大拉应力、最大压应力和竖向最大位移的回归模型;将回归模型作为目标函数,采用遗传算法进行多目标优化,获得Pareto最优解集.研究结果表明:根据工程实际需要,矿房跨度为26.0 m、矿柱跨度为28.0 m及顶板厚度为6.7 m为开采最佳结构参数.
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