沙牌拱坝整体抗震安全性评价

以沙牌拱坝为例，将坝体及两岸潜在滑动块体在内的近域地基作为一个体系，考虑坝—基—库水动力相互 作用、坝体混凝土破坏、无限地基辐射阻尼、坝体横缝与坝肩可能滑动岩块结构面的动态接触非线性效应及坝基 裂隙岩体的非线性等因素的影响，研究了沙牌拱坝在不同概率水平地震作用下的地震响应与破坏形态，提出以坝 体控制性位移时程曲线的突变并无限增长、坝基交界面出现贯通性破坏区及有限元计算发散作为拱坝整体失稳的 判据，评价了高拱坝的整体抗震安全性，获得了一些有益的结论，可供借鉴。

Integrated Aseismic Safety Evaluation of Shapai Arch Dam

Taking Shapai arch dam for an example, the dam body and the near field foundation including potential sliding block on two banks are regarded as a system, and several comprehensive influence factors including dam foundation reservoir dynamic interaction, failure of dam concrete, infinite foundation radiation damping, dynamic contact nonlinearity effect of transverse joints and sliding surface, and the nonlinearity of fractured rock on dam foundation, are taken into account to study their effects on seismic safety of arch dam. And the seismic response and failure modes of the arch dam under the earthquake with different levels are studied. Then the instability criteria of the arc dam is proposed according to abrupt change of time dependant displacement curves on the dam, the occurring of penetrated failure zone on the dam foundation interface and the divergence of finite element calculation. Finally, a useful discussion of evaluation method for integrated aseismic safety of arch dam is carried on, which provides reference for similar project.