混凝土拱坝坝肩抗滑稳定三维非线性有限元分析  

Analysis of abutment stability of concrete arch dam by three-dimensional nonlinear FEM

作　　者：袁志刚[1] 马连军[1] 种秀灵[2] 

机构地区：[1]江西省水利规划设计院规划设计分院,江西南昌330029 [2]四川水利职业技术学院环境系,四川都江堰611830

出　　处：《人民长江》2010年第2期9-12,27,共5页Yangtze River

摘　　要：拱坝坝肩的稳定是保障拱坝安全的关键因素之一。目前,拱坝坝肩稳定分析多采用刚体极限平衡法,该法不能考虑岩体的弹塑性变形,也不能模拟岩体构造的复杂性,所以就不能很好地反映坝肩岩体的破坏机理以及坝体与基岩的整体作用效果。从材料的弹塑性理论出发,应用三维非线性有限元法对坝体和坝肩岩体抗滑稳定进行分析。通过对具体工程模型的计算分析,分别以荷载突变和材料强度逐渐降低两种方式对坝肩岩体抗滑安全稳定给予评价。工程分析成果表明:非线性有限元法是进行拱坝及坝肩稳定分析的一种有效方法,能充分反映大坝与坝基岩体的共同作用效应。The stability of arch dam abutment is one of key factors for the dam safety. At present, the stability analysis of arch dam abutment mainly depends on rigid body limit equilibrium method that does not consider the elasto - plastic deformation of rockmass and can not simulate the complexity of the rockmass structure. As a result, application of the method cannot reflect the destructive mechanism of the dam abutment rockmass, as well as the integral effect between dam body and bedrock. We carry out an analysis on anti - slide stability of the dam body and abutment rockmass by three - dimensional nonlinear FEM based on the theory of elasticity and plasticity of materials. The anti - slide stability of arch dam abutment rockmass is evaluated in two ways of mutation load and material strength decreasing gradually respectively. The analysis results indicate that, nonlinear FEM method is an effective tool for analyzing the stability of arch dam abutment and its application can well reflect the interaction between arch dam and the bedrock.

关 键 词：三维非线性有限元 拱坝坝肩岩体 应力和位移 抗滑稳定安全系数 本构关系 

分 类 号：TV642.4[水利工程—水利水电工程]