一大型倾倒体边坡非线性强度折减稳定性分析  

STABILITY ANALYSIS ON A LARGE-SCALE TOPPLING-TYPE SLOPE USING NON-LINEAR STRENGTH REDUCTION METHOD

作　　者：周言[1] 王启鸿[2] 符文熹[1] 

机构地区：[1]四川大学水力学及山区河流保护国家重点实验室水利水电学院,成都610065 [2]中国水电顾问集团西北勘测设计研究院工程分院,兰州730050

出　　处：《地质灾害与环境保护》2010年第3期108-112,共5页Journal of Geological Hazards and Environment Preservation

基　　金：国家自然科学基金项目(编号:40972190);国家973计划项目(编号:2010CB226802)

摘　　要：分析的大型倾倒体边坡位于西藏林芝地区巴河上老虎嘴水电站右岸交通洞出口附近。该倾倒体坡体结构破碎,节理发育,边坡开挖后多次发生滑塌。在分析该倾倒体成因基础上,其强度特性用适于节理岩体的Hoek-Brown准则描述;计算采用非线性强度折减弹塑性数值方法;并对比了刚体极限平衡法计算结果。结果表明,两种方法获得的整体安全系数基本一致;加固前边坡基本处于极限平衡状态;数值分析较好地揭示了边坡失稳滑动特征;经工程措施处理后稳定性总体满足设计要求。The large-scale toppling-type slope is located at near the traffic tunnel outlet of the Laohuzui hydropower station,on the right bank of Bahe River in the Linzhi City of Tibet.The structures of the rock mass are very badly with a great amount of rock joints distributed in the slope.Sliding failure has occurred many times during the excavation.By analyzing the genetic mechanism of topping,the shear strength of rock mass was described using the generalized Hoek-Brown criterion,which was widely used in the jointed rock mass.The numerical analysis was based on the non-linear shear strength reduction method（SSR）,and comparign its result with the ones obtained by the limit equilibrium method（LEM）,the conclusions are almost identical.The computational results indicate that： the section of slope is almost in a limit equilibrium state before treatment and reinforcement,and the method of SSR numerical analysis reflected well on its failure and sliding features.

关 键 词：倾倒体边坡 非线性强度折减 HOEK-BROWN准则 安全系数 

分 类 号：TU457[建筑科学—岩土工程]