矿柱是支撑空区稳定性的主要单元,矿柱的回收必然会造成空区应力的重新分布,从而对其稳定性造成影响。基于应力增量理论,对某矿山矿柱回采过程中的安全性进行了理论分析,并根据矿柱的回收顺序建立了数值分析模型,计算得到了各矿柱开采前后的应力变化情况。计算结果表明,该矿山二、三采区一中段的间柱安全系数都大于1,即所有间柱在矿柱回采的过程中都处于安全状态。
Pillars are main support units of goaf stability.The recovery of the pillars will cause stress redistribution and stability of the goaf.The pillaring process security is analyzed based on stresses incremental theory.The numerical model is established according to the order of pillar recovery.The stress of each pillar before and after mining are calculated,the results show that all factors of pillars safety are greater than 1,that is,all the pillars are in a safe state.