Seismic stability of embankment on soft soil deposit
Seismic stability of embankment on soft soil deposit
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DOI：
10.1680/ijpmg.2011.11.2.50
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发表时间：
2011-01-01
影响因子：
1.9
通讯作者：
Tamamura, Shuji
中科院分区：
文献类型：
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作者：
Okamura, Mitsu;Tamamura, Shuji
即使在强烈的地震地面运动中，置于具有水平地面的不可液化地基土上的压实良好的地基通常也被认为是稳定的。然而，一些案例表明，如果地基土是高度可压缩的，如厚的软粘土和泥炭沉积物，则这种填料可能会损坏。路堤中饱和区厚度的增加和饱和区中路堤土应力的减小（两者都是由于路堤的沉降）被推测为潜在的机制。在这项研究中，进行离心试验来验证这一假设。准备了两种类型的模型-刚性地基土层上的沉降和软粘土存款上的沉降，并施加了水平基础震动。路堤顶部的沉降和变形的振动过程中的粘土上的路堤较大。
Well-compacted embankments resting on non-liquefiable foundation soils with a level ground surface are usually considered stable even during strong earthquake ground motions. Some case histories, however, suggest that such embankments may be damaged if the foundation soil is highly compressible, such as thick soft clay and peat deposits. An increase in the thickness of the saturated zone in the embankment and reduction of stresses of embankment soil in the saturated zone, both owing to subsidence of the embankment, are surmised as underlying mechanisms. In this study, centrifuge tests were conducted to verify this hypothesis. Two types of models - embankments on a stiff foundation soil layer and embankments on a soft clay deposit - were prepared, and horizontal base shakings were imparted. Crest settlement and deformation of the embankment during shaking were larger for the embankment on the clay.