采用三维非线性有限元法,模拟了杨房沟拱坝坝体、坝基岩体及主要断层结构面,对坝体进行了位移应力分析,并结合三维极限平衡法分析,对坝肩关键性的可能滑动块体进行了有限元法抗滑稳定分析,论证了两岸关键性的滑块抗滑稳定安全系数均满足设计要求.超载法计算分析成果表明,杨房沟拱坝起裂超载系数在1.6左右,拱坝强度超载系数为4.5~5.0,与国内同等规模拱坝水平相当.在地震作用下,拱坝变形和应力与国内同等工程相类似,坝肩可能滑动块体抗震稳定性满足要求.综上所述,杨房沟高拱坝在正常工况、超载工况及地震工况下均具有较好的整体安全性.%Three-dimensional nonlinear finite element analyses are carried out on the arch dam in Yangfanggou Hydro -power Station , in which the arch dam , the rock foundation and major fault structural planes are simulated.The stability of the dam abutment is then analyzed by the three-dimensional limit equilibrium method.Results show that the crack ini-tiation and ultimate strength overload coefficients of the arch dam are 1.6 and 4.5~5.0 respectively, which are of the same level as similar arch dams in China.Under the earthquake condition , deformation and stresses of the dam body are similar to other arch dams.The stability of the dam abutment against sliding also meets the design requirement.In con-clusion , the Yangfanggou arch dam is of good global safety levels under the normal , overload and earthquake conditions.
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