倾斜中厚矿体采场宽度优化

Optimization of stope width of inclined medium thick ore body

采用弹性力学分析得到顶板受力状态与采场宽度的关系,在计算所得采场安全开采最大宽度为12.1 m的基础上,结合矿山实际开采条件,提出采场结构参数初选方案;运用数值分析方法模拟获取不同结构参数下采场的力学响应特征;采用多目标决策理想点法综合考虑安全和经济两大因素,计算各方案评价指标集与理想解的向量相似度,得到各方案的优越度排序,最终实现采场结构参数的综合优化。研究结果表明:在开挖过程中,最大压(拉)应力与矿房宽度和矿柱宽度成正比,塑性区体积与矿房宽度成正比,安全率与矿房宽度成反比;矿房宽为12 m、矿柱宽为8 m的方案为综合考虑安全与经济因素的开采最佳结构参数方案。

Based on the fact that the relationship of roof stress status between stope widths was obtained by elastic mechanics analysis and the stope safe mining maximum width was calculated as 12.1 m, the mining structure parameters primary schemes were put forward combined with the actual mine exploitation condition. The mechanical response characteristics under different structural parameters were obtained by numerical analysis simulation. The safety and economy factors were comprehensively considered by multi-objective decisive TOPSIS (technique for order preference by similarity to an ideal solution) method, the superior orders of schemes were determined by calculating the vector similarity of evaluation indexes set to ideal solution, and ultimately the comprehensive optimization of stope structural parameters was realized. The results show that the maximum pressure (pull) stress during stope excavation is respectively proportional to the chamber and pillar width, the plastic volume is proportional to the chamber width and the safety factor is inversely proportional to the pillar width. The scheme with chamber width 12 m and pillar width 8 m is the optimal stope mining structure parameters which comprehensively consider safety and economy factors.