Numerical simulation of water film formation in saturated sand soils with weak permeability interlayers after liquefaction
WANG Binghui, WEI Wenhao, JIN Dandan, XU Shuai, ZHANG Lei
1. School of Civil Engineering and Architecture, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu 212100, China; 2. Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang, Jiangsu 212013, China
Abstract：To investigate the influence of water film produced by the liquefaction of saturated sand with weak permeability on the distribution of sand strength and deformation index, the onedimensional finite difference model of liquefied water film in saturated sand was established to simulate the formation mechanism, development and dissipation process of water film in the liquefaction process of saturated sand with weak permeability fine sand, and the relationship between the water film and the characteristic parameters of soil layer for especially the interlayer. The results show that there is obvious plateau stage in the process of excess pore water pressure dissipation, and the starting and ending points have good relationship with the formation of the maximum thickness and disappearance of the water film. The formation and development of water film is closely related to the duration of high pore pressure. In the case of weak permeability interlayer, the water film is produced under the interlayer, and the duration of high pore pressure application in saturated sand is significantly longer than that without interlayer, which has adverse effect on soil deformation. The rationality of the model is verified by comparing with the experimental results.
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