李官集铁矿采场动态地压监测及数值分析  

Dynamic Ground Pressure Monitoring and Numerical Analysis of Stope in Liguanji Iron Mine

作　　者：李正胜[1,2] 李洪军[3] 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083 [2]金属矿山高效开采与安全教育部重点实验室,北京100083 [3]华北水利水电大学土木与交通学院,河南郑州450045

出　　处：《金属矿山》2015年第3期58-62,共5页Metal Mine

基　　金："十二五"国家科技支撑计划项目(编号:2013BAB02B08);国家自然科学基金重点项目(编号:51034001)

摘　　要：针对李官集铁矿点柱式分层充填法的特点,按照矿山实际的开采和充填步骤,对采场中的间柱、点柱、充填体和上下盘围岩的应力变化进行动态监测和分析,并考虑矿体中优势结构面的影响,运用3DEC构建含有优势结构面的岩体模型,结合地压的实际监测变化量和数值模拟得到的地压值匹配,分析了点柱式分层充填法开采过程李官集铁矿的地压变化规律。结果显示:1开采初期,矿柱和围岩共同支撑上部载荷,随着开挖高度的增加,应力由点柱逐渐向围岩转移,上部载荷主要由围岩体支撑;2应力在上下盘岩体之间随开采向上交替变化:开挖层应力增加,回填层应力局部恢复,扰动层应力释放。在同一点柱间地压呈现分层转移规律,并随开挖进行循环往复。Based on the characteristics of point pillar slice stoping and backfilling method of Liguanji iron ore,the variation of stress including pointed pillar,barrier pillar,filling body,and upper and lower sides wall rock has been monitored and analyzed under the actual mining and filling process of mine. With the consideration of the preferred planes,a rock mass structure model has been constructed by the（ 3 Dimension Distinct Element Code） 3DEC numerical simulation software. In addition,combined with the actual monitoring and the numerical simulation,and the match with the ground pressure,the pressure variation regularity in the progress of pillar slice stoping and backfilling method was analyzed. Results show that： 1At the beginning of mining,the upper loading is supported by the pillars together with the host rock. With the increase of excavation height,the stress is transformed from the point pillar to host rock. The upper stress was mainly supported by the host rock; 2The stress in the hanging side and heading side changed alternately with the mining： the stress in excavation layer increased,the stress in backfill layer recovered,and the stress in disturbance layer released. The ground pressure presents as the layered transformation rule in the same pillar and is cycled with the excavation mining.

关 键 词：点柱法 分层充填 动态地压 数值分析 地压规律 

分 类 号：TD324[矿业工程—矿井建设]