桑郎拱坝整体稳定安全度数值分析

Numerical analysis of stability of Sanglang arch dam

采用三维弹塑性有限元方法,利用超载法、强度储备系数法和综合法分析了桑郎拱坝的失稳破坏过程,得到其整体破坏特征和整体安全系数.计算结果表明,模拟破坏的方法不同,其渐进破坏过程和失稳模式不同,但各种方法都同时反映出两侧拱端是坝体最薄弱的部位,而根据收敛性和突变性综合判断得到大坝的整体安全度,该稳定安全度满足要求.

Based on the three-dimensional elastoplastic FEM,the failure process of Sanglang arch dam is studied with overload method, strength reduction method and synthetic method respectively. The failure mechanism of the dam and its integral safety degree are studied. The computation results show that the different simulation methods lead to different destruction processes and different failure modes for the dam. However,all the methods present that the arch abutments are the weakest position of the dam body. The integral safety of the dam is estimated synthetically by the convergence of interactive process and catastrophe point of the solution. The research results show that the safety margin of Sanglang arch dam meets the design demand.