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Development and verification of a soil-water coupled finite deformation analysis based on u-w-p formulation with fluid convective nonlinearity

机译：基于流体对流非线性u-w-p公式的水土耦合有限变形分析方法的开发与验证

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摘要

Most soil-water coupled analyses of saturated soil are based on the u-p formulation, where a set of equations is reduced by assuming that the acceleration of the fluid phase relative to that of the solid phase is less than that of the solid phase. Therefore, this analysis cannot be used for a coupled analysis with dynamic water flow in highly permeable soil. This study aims to present a soil-water coupled finite deformation analysis method based on full formulation, or u-w-p formulation. This method differs from conventional methods in the following ways: (1) the governing equations explicitly include the equation of motion for the fluid phase, (2) a relative convective term is used to describe a change in the relative configuration between the two phases, and (3) the moving/inclined discharge boundary is directly implemented to the discretized governing equations. Herein, one/two dimensional seepage and plane-strain deformation analysis results are reported. In the seepage analysis, accelerating permeation of pore water is obtained and the undrained constraint condition is verified. In the deformation analysis, dynamic migration in a high permeable soil specimen, i.e., wave propagation and rotational flow of pore water, is observed. (C) 2019 Production and hosting by Elsevier B.V. on behalf of The Japanese Geotechnical Society.
机译：大多数饱和土的水-水耦合分析都是基于u-p公式，其中假设流体相相对于固相的加速度小于固相的加速度，从而简化了一组方程。因此，该分析不能用于高渗透性土壤中动态水流的耦合分析。这项研究的目的是提出一种基于完全公式或u-w-p公式的水土耦合有限变形分析方法。该方法在以下方面与常规方法不同：（1）控制方程明确包含了流体相的运动方程；（2）相对对流项用于描述两相之间相对构型的变化， （3）将移动/倾斜的排放边界直接应用于离散控制方程。在此，报告了一维/二维渗流和平面应变变形分析结果。在渗流分析中，获得了孔隙水的加速渗透，并验证了不排水的约束条件。在变形分析中，观察到高渗透性土壤样品中的动态迁移，即波传播和孔隙水的旋转流。 （C）2019年由Elsevier B.V.代表日本岩土工程学会制作和主持。

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