小官庄铁矿深部应力场分析

Deep In-situ Stress Filed in Xiaoguanzhuang Iron Mine

为研究小官庄铁矿深部应力场尤其是水平应力对岩体移动的影响,根据小管庄铁矿原岩应力测试结果,对小官庄矿地应力场的分布规律进行定量的综合分析与研究;结合小官庄铁矿开采工程实际,对2个相邻采区围岩变形监测结果进行了讨论分析。分析结果表明:该矿地应力场是以水平压应力为主导的水平构造应力场;最大水平主应力方位与本采区主要地质构造方向有关,最大水平主应力与巷道轴向夹角的大小及卷道变形有关;布置分段巷道的方位是控制岩体移动变形的关键,而最佳方位是平行于最大水平应力方向。

With Xiaoguanzhuang iron mine as a case study,we investigated the influence of deep geostress field,in particular,the influence of maximum horizontal stress on rockmass displacement caused by deep mining.Based on in-situ stress measuring results,we quantitatively analyzed the distributing law of the in-situ stress field in the mine.To provide basis for the support of surrounding rockmass of the roadway,we monitored the rockmass deformation and made detailed measurements at two adjacent mining areas.Results showed that the geostress field was dominated by horizontal stress,which also determined the mining activity and its effect.The orientation of maximum horizontal stress was influenced by geological structure.Deformation of the roadway was also affected by the angle between the orientation of maximum horizontal stress and the axis of roadway.Other stress-control measures,including artificial support,are briefly discussed.It＇s concluded that proper orientation of sublevel roadway is the key to controlling rockmass displacement and deformation,and the optimum orientation is parallel to the maximum horizontal stress.