隔离矿柱参数优化与监测分析

Parameter optimization and monitoring analysis of isolated pillar

针对李官集铁矿-320m中段采区水平隔离矿柱设计厚度过大造成资源浪费问题,采用理论计算与数值模拟方法对隔离矿柱进行了参数优化,最终推荐厚度不低于23m。为监测隔离矿柱在开采中的稳定性,矿山在-320m中段建立了一套地压监测系统。应力与位移监测结果显示,监测时段该隔离矿柱上方各测点岩体无大范围应力集中和明显变形,整体处于稳定状态。局部区域因地质构造出现小范围喷层开裂,但尚未达到影响稳定性的破坏尺度,后续可根据监测数据适时调整隔离矿柱参数。

Aiming at the problem of resource waste caused by excessive design thickness of horizontal isolated pillar in the-320 m middle mining area of Liguanji Iron Mine,the parameters of isolated pillar are optimized by theoretical calculation and numerical simulation,and the thickness is recommended to be no less than 23 m.In order to monitor the stability of isolated pillar in mining,a set of ground pressure monitoring system is established in the-320 m middle section of mine.The results of stress and displacement monitoring show that the rock mass above the isolated pillar has no large-scale stress concentration and obvious deformation during the monitoring period,and is in a stable state as a whole.The spray layer cracking occurs in a small range due to geological structure in a local area,but it has not reached the failure scale that affects the stability,and the isolation pillar parameters can be adjusted timely according to the monitoring data.