无底柱深孔后退式崩矿法采场结构参数优化

为实现某铅锌矿山无底柱深孔后退式崩矿法安全高效开采,开展采场结构参数优化研究.实测-650 m中段原岩应力,运用Surpac-FLAC3D模型生成技术构建数值分析模型,进而采用多元应力回归方法反演初始地应力场.通过弹性力学小薄板理论分析得到顶板稳定性随采场结构参数的变化关系,结合实际采准条件,提出采场结构参数初选方案.基于反演地应力场,进行初选方案开采数值分析,获得各方案力学响应指标.引入多目标理想点法决策,考虑安全和经济指标,计算方案评价指标集与理想解的向量近似度,优化确定该矿无底柱深孔后退式崩矿法采场结构参数为矿房采场宽10 m,矿柱采场宽8 m.

Stope Parameters Optimization of Non-pillar Longhole Retreat Caving

In order to realize safe and efficient mining of non-pillar longhole retreat caving in a lead-zinc mine， stope parameters optimization was conducted. Field measurement of in-situ stress was carried out on-650m level， and a numerical model was constructed by Surpac-FLAC^3D modeling technique. On these grounds， in-situ stress field was inversed by multiple regression method. The change relation of roof stability with stope parameters was obtained by using the small thin elastic mechanics theory， and the primary stope parameters schemes were put forward by combining with actual mining condition. Based on the inversion of ground stress field， the mining numerical analysis of primary schemes was conducted to get mechanical response indexes of different schemes. The safety and economy indexes were comprehensively considered， and the multi-objective TOPSIS decision method was introduced， the superior order of parameter schemes was determined by calculating the vector similarity of evaluation indexes set to ideal solution. Optimal stope parameters of non-pillar longhole retreat caving were finally determined， i.e.， chamber width 10m， pillar width 8m.