Sliding block analysis of lateral spreading based on centrifuge results
Sliding block analysis of lateral spreading based on centrifuge results
复制标题
基于离心机结果的横向扩展滑块分析
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
R. Dobry
中科院分区：
文献类型：
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作者：
M. Sharp;R. Dobry
本文回顾了在RPI上在50 g的内华达细砂上进行的一些横向扩散离心机试验，并用于建立基于波传播理论的一阶分析模型，该模型可以很好地预测永久地面位移的测量模式。含均匀饱和砂层的微倾斜层流箱在飞行中基底振动引起液化和横向扩展。在试验中，水和比水黏度高50倍的粘性流体都被用作孔隙流体。在震动过程中和震动结束时观测到的侧向位移剖面非常不同：“粘性流体”试验中观测到的横向位移剖面平滑且或多或少平行，而“水”试验中观测到的横向位移剖面包含一个集中的应变区。其他差异还包括，在“水”试验中，液化深度稳定在震动早期的中间深度，而液化锋在整个震动过程中向下传播，并伴有密切相关的下降。
A number of lateral spreading centrifuge tests conducted at RPI at 50 g on fine Nevada sand are reviewed and used to produce a first order analytical model based on wave propagation theory which predicts well the measured patterns of permanent ground displacement. In-flight base shaking of a slightly inclined laminar box containing a homogeneous saturated sand deposit induces liquefaction and lateral spreading. Both water and a viscous fluid fifty times more viscous than water are used as pore fluid in the tests. The observed lateral displacement profiles during and at the end of shaking are very different: smooth and more or less parallel profiles in the “viscous fluid” tests, and profiles containing a concentrated straining zone in the “water” tests. Other differences include stabilization of the depth of liquefaction at an intermediate depth early in the shaking in the “water” tests, compared with downward propagation of the liquefaction front throughout the shaking accompanied by a closely related dow...