高拱坝沿建基面抗滑稳定性的分析方法研究

Methods for analyzing sliding resistance stability along the base surface of high arch dam

本文从运动稳定性的理论出发 ,认为拱坝沿建基面的强度破坏实质上是稳定性问题 ,属于极值点失稳 .文章还提出稳定性分析的刚性体方法和变形体方法 ,以及与变形体方法相应的两类失稳判据 :收敛性判据及突变性判据 ,并比较了两种方法的优缺点 .以小湾高拱坝为研究对象 ,根据有限元分析的成果 ,对它沿建基面的稳定性进行了定量研究 ,得到整体的稳定安全度 .并根据破坏的形态和发展过程 ,得出结论 :小湾拱坝只有在坝体发生破坏的同时 ,拱坝才能沿建基面滑移 .

According to the theory for stability of motion, the failure of arch dam along the base is regarded as the problem of stability at extreme state of motion. Two methods, namely rigid\|body method and deformed\|body method, are proposed for analysis of stability. The corresponding criteria for discrimination of stability are suggested. The advantage and disadvantage of these methods are compared. By using these methods the stability of the high arch dam in Xiaowan Hydro project is studied quantitatively and the safety degree of the dam is obtained. It is concluded that the sliding will not occur except for the failure of the dam body is happened.