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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。
Taking Shapai Arch Dam as an example, considering the near-field foundation of the dam body and the potential sliding blocks on both banks as a system, considering dam-base-reservoir hydrodynamic interaction, dam concrete failure, infinite foundation radiation damping, The nonlinear effect of the dynamic contact between the transverse joint and the dam sliding surface and the non-linearity of the dam foundation fractured rock mass, the seismic response and failure modes of the Shapai Arch Dam under different probabilistic seismic levels are studied, It is proposed that the abrupt change of the time-history curve of the controlled displacement of the dam with infinite growth, the failure zone at the interface of the dam foundation and the divergence calculated by the finite element method as the criterion for the overall instability of the arch dam, Some useful conclusions have been obtained for reference.