Seismic performance of earth-core and concrete-faced rock-fill dams by large-scale shaking table tests
Seismic performance of earth-core and concrete-faced rock-fill dams by large-scale shaking table tests
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土心墙混凝土面板堆石坝抗震性能大型振动台试验
DOI：
10.1016/j.soildyn.2013.09.019
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发表时间：
2014
影响因子：
4
通讯作者：
Linjuan Yuan
中科院分区：
文献类型：
--
作者：
Linjuan Yuan
本文对我国最高的两座心墙堆石坝和混凝土面板堆石坝进行了大型地震模拟振动台试验研究。通过白色噪声、不同类型和不同震级的地震激励等试验，对ECRD和CFRD模型的抗震性能进行了分析和研究。试验结果表明，水库蓄水对ECRD模型结构和抗震性能的影响远大于对CFRD模型的影响。在强激励下，面板堆石坝的平均基频下降幅度小于ECRD模型。加速度放大系数随着输入峰值加速度的增大而减小。最大加速度出现在ECRD模型的顶部，而面板堆石坝模型的最大加速度出现在0.6-0.9坝高。两种模型的地震残余变形都很小。在强震作用下，面板堆石坝模型的残余变形小于ECRD模型。两个模型的主要破坏模式是下游边坡3/4高度处的浅层滑动。上述分析表明，面板堆石坝的抗震性能优于ECRD的上级。
Two of China's highest earth-core rock-fill dams (ECRDs) and concrete-faced rock-fill dams (CFRDs) were simulated by large-scale earthquake simulation shaking table tests in this work. A series of staged tests were performed, including white noise, different types of earthquake excitations with different magnitudes etc. The seismic performance of the ECRD and CFRD models were analyzed and investigated. The test results indicated that reservoir impoundment influenced the structure and seismic characteristics of the ECRD model much more than the CFRD model. The average fundamental frequency of the CFRD decreased less than the ECRD model when subjected to strong excitation. The acceleration amplification factors decreased as the input peak acceleration increased. The maximum acceleration occurred at the top of the ECRD model, while it occurred at 0.6–0.9 dam height of the CFRD model. Seismic residual deformations of the two models were very small. When subjected to strong earthquake excitation, the residual deformation of the CFRD model was smaller than that of the ECRD model. The dominant failure pattern of the two models was shallow sliding at the height of 3/4 on the downstream slope. The above analysis indicated that seismic performance of CFRD was superior to ECRD.
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