基于响应面法的破碎围岩条件下采场结构参数优化研究

Optimization research on stope structure parameters in broken rock conditions based on the response surface method

为了获得最优的采场结构参数,综合考虑矿山的安全性和经济性,提出响应面的方法,采用中心复合试验研究采场高度、矿柱直径、矿柱排距和矿柱间距对破碎围岩条件下矿柱最大拉应力、最大压应力和矿石回收率的影响规律。通过有限元的计算结果建立矿柱最大拉应力、最大压应力和矿石回收率响应面回归模型,最后采用基于整体满意度准则的非线性多目标优化技术对采场结构参数进行优化。结果表明:整体满意度随采场高度的增加而降低,随矿柱直径、矿柱间距和矿柱排距的增大,呈现出先增大后减少的趋势,白牛厂矿最优的采场高度为3.5 m,矿柱直径为3.5 m,矿柱间距为3 m,矿柱排距为5 m。该方法科学合理,为白牛厂矿破碎围岩条件下安全、经济、高效回采矿石提供了技术保障。

To obtain the optimal stope structure parameters, when the mine safety and economy were considered together, the response surface method was put forward, and the central composite design experiments were performed to investigate the effect of stope height, pillar diameter, pillar spacing and pillar array pitch in broken rock conditions on the maximum tensile stress, maximum compressive stress and ore recovery rate. The response surface regression models of the maximum tensile stress, maximum compressive stress and the ore recovery rate were established by the results of finite element model, then the stope structure parameters were optimized by the method of nonlinear multi-objective technology based on the overall desirability criteria. It is found that the overall desirability of stope reduced along with the increase of mining height, and it presents a trend of increase, then decreases with the increase of pillar diameter, pillar spacing and pillar width. The optimal mining height is 3.5 m, the pillar diameter is 3.5 m, the pillar spacing is 3 m and the pillar array pitch is 5 m. This method is scientific, reasonable, and provides the technical support for Bainiuchang mine＇s safety, economy and efficient exploitation in broken rock conditions.