基于开采环境再造深孔诱导崩矿方案优化研究

针对新疆喀拉通克铜镍矿高价值软破矿体的特征,提出了开采环境再造深孔诱导崩矿采矿技术,并主要从维护采场稳定性和保证矿石合格块度率的角度,对崩矿方案进行优化研究.首先,运用FLAC3D软件对侧向挤压崩矿和水平分层崩矿过程进行数值模拟,分别从位移场和应力场的分布和变化来分析不同方案对采场结构稳定性的影响;其次,分析了节理裂隙分布对原始矿体的切割作用,以及爆破挤压作用对崩落块度的影响.研究结果表明,侧向挤压崩矿更有利于维护采场结构的稳定,引导节理裂隙对矿体的合理切割,并能充分发挥挤压效应,提高崩落矿石块度的合格率.图4,表1,参14.

Study on Optimizing the Deep-hole Induction Caving Scheme Based on the Reconstructed Mining Environment

According to the characteristics of complex high-value deposit in XinJiang province,the reconstructed mining environment and deep-hole induction caving method was proposed in the first time,and then the caving schemes were optimized based on the stope's stability and ore's fragments size. Firstly,the caving process in the side-extruding scheme and horizontal-slice scheme were simulated by FLAC3D,and the influence on stope's stability was evaluated by analyzing the distribution and variation of both stress and displacement fields,respectively. Secondly,the cutting actions by cracks and joints,as well as the squeezing actions by blasting on the original ore were analyzed. Finally,the Side-extruding caving scheme was considered to be the preferred plan,and the reasons as follow:(1) more advantageous to maintenance stope's structure stable; (2) guiding joints to cut the ore body reasonably; (3) can utilize the squeezing effect fully and improve the caving quality. 4figs.,1tab.,14refs.