岩爆倾向条件下阶段空场胶结充填采矿法采场结构参数确定及应用

针对小厂坝矿区的矿岩特点和深部回采区域岩爆倾向性特征,确定采用阶段空场胶结充填采矿法。通过对开采后的应力分布规律分析,确定了沿走向布置矿块,并以切割槽的形成为手段,改变围岩和矿体中的应力场分布状态,实现了卸压开采。通过矿岩物理力学分析和理论计算,确定了小厂坝矿区岩爆区域分段凿岩阶段空场的矿房跨度、顶板厚度、间柱宽度分别为40m、6m、10m。通过对原设计底部结构形式的优化,提高了出矿效率,增大了底柱的厚度,提高了作业的安全性。应用实践表明,岩爆倾向条件下采场结构参数的优化,有效防止了地压灾害、提高了生产效率,保证了生产安全,经济和社会效益显著。

Determination of stope structure parameters of bench open stoping with subsequent cemented backfill in rock-burst tendency and its application

For ore-rock characteristics in Xiaochangba mining area and the rock-burst tendency characteristics in the deep mining zone,the bench open stoping with subsequent cemented backfill was selected.According to analysis of the stress distribution rule after mining,the block layout was determined to be along the strike;and by the means of cutting grooves formation,the surrounding rock and the stress field distribution in the ore body were changed and pressure relief mining was realized;through theoretical calculation and ore-rock mechanical analysis,the reasonable ore room span,roof thickness and the distance between columns of sectioned drilling and bench open stoping in the rock burst area of Xiaochangba mining area were determined to be 40 m,6 m,10 m respectively.Through the optimization of original stope bottom structure,mining efficiency,thickness of sill pillar and operation security were improved.Application practice shows that optimization of stope structure parameters in rock-burst tendency can effectively prevent ground pressure disasters,improve production efficiency and ensure safe operation,creating significant economic and social benefits.