会泽铅锌矿深部矿区巷道围岩稳定性研究

Surrounding Rock Stability of Roadways in Huize Lead-zinc Mine Deep Area

会泽铅锌矿开采已经进入深部矿段,"三高"特征日益严重.基于对已有资料分析及野外调查,对1031矿段原岩分析研究,对矿段揭露岩层进行综合分类,得出原岩特征.通过原位测试,得出原岩力学参数,运用FLAC3D对巷道围岩进行稳定性分析计算,计算结果表明巷道开挖之后,应力重新分布,出现应力集中现象,其中水平应力于边墙中点处达到最大值,竖直应力分别于底板中点及顶拱处达到最大值.岩体的抗压强度大于岩层模拟的最大压应力,说明巷道开挖之后是稳定的,只有局部需要支护,符合实际开挖情况.

Huize Pb-Zn ore has already entered into deep block mining along with more serious‘3-high’ characters. Based on researches on existing materials and field survey,we obtained the characters of parental rocks by classifying exposed rock strata. Throughout in-situ test,the mechanical parameters of parental rocks has be derived,meanwhile. The analysis results of flac3D employed on stability of surrounding rocks of roadway showed the stresses has been redistributed after exaction,and gave rise to stresses concentration. In the middle of wall,the horizontal stress reached its maximum. However,the maximum vertical stress happened at the middle of bottom and top arc. The compressive strength of rocks is greater than the modeled maximum compressive stress,which testifies that it is stable after excavation as long as local retaining and protecting has existed,and this also conform to the actual conditions.