A Field Study of Momentary Liquefaction Caused by Waves around a Coastal Structure
A Field Study of Momentary Liquefaction Caused by Waves around a Coastal Structure
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DOI：
10.1061/(asce)0733-950x(2007)133:1(28
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
M. Mory;H. Michallet;D. Bonjean;I. Piedra-Cueva;Jean-Marc Barnoud;P. Foray;S. Abadie;P. Breul
中科院分区：
文献类型：
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作者：
M. Mory;H. Michallet;D. Bonjean;I. Piedra-Cueva;Jean-Marc Barnoud;P. Foray;S. Abadie;P. Breul
本文介绍了在位于海滩上的第二次世界大战地堡周围进行的实地实验的结果。该结构在涨潮时被水包围，并受到强烈的波浪强迫。通过在土壤内部不同水平位置放置压力传感器，获得了孔隙压力同时测量的时间序列。他们证明了河床顶部的沉积层并没有连续地保持静态平衡。瞬时液化表现为向上压力梯度的出现，压力梯度可以克服沉积层的有效重量。通过傅里叶分析，与Sakai等人1992年提出的理论进行了比较，该理论可以量化土壤内部孔隙压力变化的阻尼。这表明土壤中存在大量气体，这一点在现场的地质内窥镜视频中得到了证实。
This paper presents the results of field experiments carried out around a bunker from the Second World War situated on the beach. The structure was surrounded by water at high tide and subject to intense wave forcing. By positioning pressure sensors at different levels inside the soil, simultaneous time series of pore pressure measurements were acquired. They demonstrated that the sediment layer on top of the bed does not remain continuously in static equilibrium. Momentary liquefaction was observed as the occurrence of an upward pressure gradient, which could overcome the effective weight of the sediment layer. Using a Fourier analysis, a comparison was made with the theory put forward by Sakai et al. in 1992 whereby the damping of pore pressure variations inside the soil can be quantified. This indicated the existence of a significant amount of gas inside the soil, which was confirmed in the field by geoendoscopic videos.