Initiation process of tension cracks in soil embankment on liquefied sandy ground investigated from centrifuge model test
Initiation process of tension cracks in soil embankment on liquefied sandy ground investigated from centrifuge model test
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DOI：
10.1016/j.soildyn.2022.107444
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发表时间：
2022-10
影响因子：
4
通讯作者：
Yomi Harada;Hiroyuki Goto;S. Sawada
中科院分区：
文献类型：
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作者：
Yomi Harada;Hiroyuki Goto;S. Sawada
地震后，土质路堤的坝顶和坡面经常出现纵向拉裂。由于裂缝对路堤稳定性的影响，了解裂缝产生的物理机制是一个重要的问题。本文通过离心机模型试验对液化地基上路堤的动力特性进行了研究。视频图像分析表明，由于地基的液化和横向扩展，路堤主体变形为水平均匀伸展，这是本研究首次发现。虽然路堤顶部和底部的水平应变几乎相等，但拉裂只出现在顶部。这可以简单地解释为，在垂直应力较低的地方，拉伸破坏先于剪切破坏，这意味着它在实践中很容易应用。
Longitudinal tension cracks have been often observed at the crest and slopes of soil embankments after earthquakes. Since the cracks affect the stability of embankments, understanding the physical mechanisms of the crack generation is an important issue. In this study, the dynamic behavior of embankments on a liquefied ground is investigated from centrifuge model tests. Video image analysis suggests that the main body of the embankment is deformed to stretch evenly horizontally due to the liquefaction and lateral spreading of the foundation ground, which is the first finding revealed by this study. Although the horizontal strain is almost equal at the top and bottom of the embankment, tension cracks occur only at the top. This can be simply explained by the fact that tensile failure precedes shear failure where the vertical stress is low, which means that it is readily applicable in practice.