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Centrifuge modeling of dynamic behavior of pile-reinforced slopes during earthquakes

ISSN号：1000-7709
期刊名称：《水电能源科学》
时间：0
分类：TU411.93[建筑科学—岩土工程;建筑科学—土工工程] TV543[水利工程—水利水电工程]
作者机构：[1]State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China
相关基金：Project（50639060） supported by the National Natural Science Foundation of China; Project（610103002） supported by the State Key Laboratory of Hydroscience and Engineering, Tsinghua University, China

关键词：离心模型试验, 加固边坡, 动态行为, 模型桩, 地震, 土压力, 反应比, 时间历程, earthquake, slope, stabilizing pile, dynamic behavior, centrifuge modeling, earth pressure, acceleration, bending moment

中文摘要：

沙的斜坡的一系列离心机模型测试被进行学习受到各种各样的运动的增强堆积的斜坡的动态行为。加速，弯曲时刻和堆积地球压力的时间历史在调整 El Centro 地震和一个周期的运动的刺激期间被获得。在现实主义的地震下面，增强堆积的斜坡的全面反应比非增强的斜坡的低。在摇晃开始了后不久，把时刻和动态地球压力弄弯的历史到达他们的最大值然后仍然保持粗略地稳定直到摇晃的结束。最大的时刻发生在 3.5 m 的高度，它是堆积的更深的节，显示在活跃装载和消极抵抗区域之间的接口。在斜坡底上面的动态地球压力稳定地随堆积的高度的增加增加。为在周期的输入运动下面的模型，在在斜坡的不同地点的反应振幅是几乎一样，不显示重要反应扩大。弯曲时刻和地球压力在一个长时期上逐渐地增加。

英文摘要：

A series of centrifuge model tests of sandy slopes were conducted to study the dynamic behavior of pile-reinforced slopes subjected to various motions. Time histories of accelerations, bending moments and pile earth pressures were obtained during excitation of the adjusted El Centro earthquake and a cyclic motion. Under a realistic earthquake, the overall response of the pile-reinforced slope is lower than that of the non-reinforced slope. The histories of bending moments and dynamic earth pressures reach their maximums soon after shaking started and then remain roughly stable until the end of shaking. Maximum moments occur at the height of 3.5 m, which is the deeper section of the pile, indicating the interface between the active loading and passive resistance regions. The dynamic earth pressures above the slope base steadily increase with the increase of height of pile. For the model under cyclic input motion, response amplitudes at different locations in the slope are almost the same, indicating no significant response amplification. Both the bending moment and earth pressure increase gradually over a long period.

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