Seismic behaviors of earth-core and concrete-faced rock-fill dams by dynamic centrifuge tests
Seismic behaviors of earth-core and concrete-faced rock-fill dams by dynamic centrifuge tests
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DOI：
10.1016/j.soildyn.2011.06.010
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发表时间：
2011-11
影响因子：
4
通讯作者：
Mujong Kim;Sei-Hyun Lee;Y. Choo;Dong‐Soo Kim
中科院分区：
文献类型：
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作者：
Mujong Kim;Sei-Hyun Lee;Y. Choo;Dong‐Soo Kim
大坝抗震性能的研究变得至关重要，但受限于缺乏实验或现场数据。采用动力离心试验方法，对土芯堆石坝和混凝土面板堆石坝两种主要坝型进行了试验模拟，研究了坝体的地震响应。应用0.05 ~ 0.5g的真实地震记录，进行了一系列分段离心试验。放大比的分布随地震荷载的大小和分区条件的不同而不同。基岩加速度超过0.3g时，波峰放大比增大，受上部松动行为影响较大。坝顶残余沉降和水平位移较小。浅层滑动是主要破坏形式。动加载对面板的最大拉应力出现在上游水位附近4/5左右高度处。最后，进行了二维数值模拟，试图模拟离心机模型。离心试验与数值分析结果基本一致，证实了离心模拟对大坝地震行为的合理模拟。
The investigation on the seismic behavior of dams becomes crucial but is limited to lack of experimental or field data. This paper aims to experimentally simulate two major dam types of earth-core rock-fill dam and concrete-faced rock-fill dam by dynamic centrifuge tests to investigate the seismic response of the dam. A series of staged centrifuge tests was performed by applying real earthquake records from 0.05 to 0.5g. The distributions of amplification ratio differed depending on the magnitude of earthquake loading and the zoning condition. The amplification ratio at the crest increased in the bedrock acceleration that exceeds 0.3g and strongly influenced by the loosening behavior of the upper part. The residual settlements and horizontal displacement at the dam crest were small. Shallow surface sliding was dominant failure. The maximum tensile stress on the face slab by dynamic loading occurred at a height of around 4/5 near the upstream water level. Finally, two-dimensional numerical simulations were performed in an effort to simulate the centrifuge models. The centrifuge tests and numerical analysis obtained mostly comparable results, thus confirming that centrifuge modeling reasonably simulates the seismic behavior of dams.