Influence of Liquefaction on Scour behind Coastal Dikes due to Tsunami Overflow
Influence of Liquefaction on Scour behind Coastal Dikes due to Tsunami Overflow
复制标题
海啸溢流液化对沿岸堤后冲刷的影响
DOI：
10.1080/19386362.2016.1246216
复制
发表时间：
2017
影响因子：
1.9
通讯作者：
T.
中科院分区：
文献类型：
--
作者：
Takegawa;N.;Sawada;Y.;Murai;K. and Kawabata;T.
在本研究中，进行了水力模型实验，以阐明液化对海啸溢流造成的沿海堤坝后面冲刷的影响。特别讨论了液化引起的冲刷剖面（冲刷深度、冲刷长度和冲刷面积）的变化。液化程度通过向上渗流来控制，向上渗流是由水箱和砂床之间的水头差引起的。沙床应用了六个水力梯度。实验结果表明，液化对冲刷剖面有显着影响。在高水力梯度下，由于砂床有效应力降低，导致边坡失稳。结果，冲刷长度因边坡破坏而增加。此外，高水力梯度时的最大冲刷深度和冲刷面积均小于低水力梯度时的最大冲刷深度和冲刷面积。
In the present study, hydraulic model experiments were conducted to clarify the influence of liquefaction on the scour behind coastal dikes due to tsunami overflow. In particular, the variation of the scour profile (scour depth, scour length and scour area) due to liquefaction was discussed. Degree of liquefaction was controlled by upward seepage, which was induced by the head difference between a water tank and a sand bed. Six hydraulic gradients were applied to the sand bed. The experimental results showed that liquefaction had a significant impact on the scour profile. At high hydraulic gradient, slope failures occurred due to reduction of effective stress of the sand bed. As a result, scour length was increased by the slope failures. Furthermore, the maximum scour depth and scour area for high hydraulic gradient became smaller than that for low hydraulic gradient.