南京栖霞山矿巷道围岩稳定性数值分析  

Nonlinear Stability Analysis of the Surrounding Rockmass of Qixiashan Mine in Nanjing

作　　者：王方汉[1,2] 曹维勤 张文如 张伯虎[1] 徐小敏[1] 

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]南京栖霞山锌阳矿业有限公司,南京210033

出　　处：《地下空间与工程学报》2009年第1期90-94,138,共6页Chinese Journal of Underground Space and Engineering

摘　　要：通过有限元计算，对南京栖霞山矿巷道的主巷道和穿脉巷道进行了非线性稳定分析。结果表明主运输巷道周围各对应部位的应力随巷道的埋深增加基本呈线性增长，相邻中段之间的应力增长幅度为6．25％～18．75％，其中巷道的拱顶和底板中部的应力增幅较大。部分中段的某些部位的应力值已经达到或甚至超过了岩石的单轴抗压强度，并伴随较大程度、较大范围的塑性区的出现。对于穿脉巷道中的矿岩巷道，其表现出来的变化规律与主巷道有些相似，巷道周围的塑性区仍集中在洞口附近。对于穿脉巷道中的高丽山砂岩巷道，由于高丽山砂岩的岩石力学参数较低，结果显示，在-225m中段巷道已经出现较大面积的塑性区，到-275m中段其塑性区发育完全，从-325m中段开始，高丽山砂岩巷道出现不稳定破坏现象。The 2-D model of the surrounding rockmass of Qixiashan mine in Nanjing is established and analyzed by using nonlinear finite element method （FEM）. The stability of the main roadway and the branch roadway is studied. It is shown that the stress of the surrounding rock increases with the burial depth linearly. The stress increasing range between the adjacent roadway is 6.25 %- 18.75 %, which is greater in the roof and in the middle of the floor. The stress in part of roadway has reached or exceeded the uniaxial compressive strength of rock and the plastic zone appeared in a large area. The main roadway and the branch roadway con- structed in the surrounding rock have the same distributing rules and the plastic zone appears near the gate of the roadway. In addition,great plastic zones in 225m and the destructed rockmass in 325m are found, where the strength of the sandstone rock. in the branch roadway is low.

关 键 词：非线性有限元 稳定性分析 塑性区 开挖模拟 

分 类 号：TU457[建筑科学—岩土工程]