A Series of Centrifuge Experiments Investigating the Effect of High Confining Pressure on Sand Liquefaction
A Series of Centrifuge Experiments Investigating the Effect of High Confining Pressure on Sand Liquefaction
复制标题
研究高围压对砂液化影响的一系列离心机实验
DOI：
10.1061/9780784482810.032
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
El-Sekelly, Waleed
中科院分区：
文献类型：
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作者：
Ni, Min;Abdoun, Tarek;Dobry, Ricardo;El-Sekelly, Waleed
本文介绍了一系列低围压和高围压下的离心试验，旨在研究有效上覆压力对净砂液化势的影响。所有的离心试验模拟约5米饱和干净的沙子存款有效上覆压力为1和6大气压，相对密度范围从45%到80%。为了达到目标的上覆岩层压力，在干净的沙子上沉积了一层不同厚度的干铅丸。采用粘性流体饱和，保持原型渗透率不变。所有的离心试验都进行了10个周期的正弦地震运动与不同的原型峰值加速度，以实现目标的最大超孔隙压力的建立。加速度，孔隙压力的建立和消散，剪切波速度进行了监测，记录，并在震动过程中或之后进行分析。在低围压下进行的实验中观察到加速度放大，而在高围压下进行的实验中发现了去放大。
This paper introduces a series of centrifuge tests—under low and high confining pressures—designed to study the effect of effective overburden pressure on liquefaction potential of clean sand. All the centrifuge tests simulate about 5 m saturated clean sand deposit under effective overburden pressure of 1 and 6 atm with relative density ranging from 45% to 80%. To achieve the targeted overburden pressures, a dry layer of lead shots with different thickness was deposited on top of the clean sand. Viscous fluid was used for saturation to keep constant prototype permeability. All the centrifuge tests were subjected to 10-cycle sinusoidal seismic motions with different prototype peak acceleration to achieve the targeted maximum excess pore pressure buildup. Acceleration, pore pressure build-up and dissipation, and shear wave velocity were monitored, recorded, and analyzed during or after shaking. Acceleration amplification was observed in experiments conducted under low confining pressures, while de-amplification was found in experiments conducted under high confining pressures.
液化图为何有效的调查：艺术与实践相结合的必要步骤
DOI：
--
发表时间：
2015
期刊：
影响因子：
--
作者：
T. Abdoun;R. Dobry
通讯作者：
R. Dobry