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Effect of abutment movements on nonlinear seismic response of an arch dam

机译：基台运动对拱坝非线性地震反应的影响

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摘要

Abutment movement that induces a reduction of the valley width in the periods of initial impoundment has been observed in a few high arch dams. In this article, the effect of the abutment movement on the nonlinear dynamic response of arch dams subjected to strong earthquakes is studied. The 285.5 m high Xiluodu arch dam is analysed. The results show that the abutment movement of 65-110 mm after initial impoundment leads to upstream displacements and a significant increase in compression stress in the arch dam under static conditions. When subjected to strong earthquake, the abutment movement results in a much larger opening of contraction joints in the middle part of the dam and prevention of opening of the other joints on both sides. Additional damage cracking is likely to occur in the surface outlets and the mid-level orifices. The damage cracking on the dam-foundation interface appears to propagate from the upstream face towards downstream, especially near the abutments where it extends one fourth thickness of the interface and is possible to damage the grout curtain.
机译：在几个高拱坝中观察到诱导初始蓄积期间山谷宽度减小的抵靠运动。在本文中，研究了基础运动对受强震而受到强烈地震的拱坝非线性动力响应的影响。分析了285.5米高的Xiluodu Arch Dam。结果表明，初始蓄水后的抵靠运动为65-110毫米，导致上游位移以及静态条件下拱坝压缩压力的显着增加。当受到强烈的地震时，邻接运动导致大坝中间部分的收缩接头打开并防止两侧的其他关节打开。表面出口和中级孔口可能发生额外的损伤裂缝。坝基界面上的损伤似乎从上游朝向下游传播，尤其是靠近其延伸的界面的四个厚度并且可以损坏灌浆窗帘。

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