石门坎拱坝坝踵底缝稳定性分析

随着拱坝高度的不断增加,坝体厚度不断减小,高拱坝坝踵破坏成为工程中非常棘手的问题。人们通过设置坝踵底缝来降低坝踵最大拉应力。但是设置底缝后,坝踵和底缝尖端部位是否稳定需要验证,目前人们对坝踵底缝稳定性判断主要采用断裂力学法,本文采用Drucker-Prage准则对坝踵和底缝尖端材料屈服性进行判断,同时对底缝的张开度进行分析。

Stability Analysis on Bottom Joint of Dam Heel of Shimenkan Arch Dam

As the arch dam height increasing and the arch dam thickness decreasing,the destruction of dam heel of the high arch dam is a very knotty problem.In order to decrease the dam heel's stress,the bottom joint is set.But the stability of the dam heel and bottom-joint top needs to be verified,at present,the fracture mechanics measures are mainly used for verifying it.In this article,Drucker-Prager criterion is used to judge the yield property of the dam heel and bottom-joint top,and to analyze the open degree of the bottom joint.