Fluid-saturated Soil Research Articles

Numerical simulation of a fluid-saturated soil under a dynamically loaded pile

The behaviour of the soil under a dynamically loaded pile toe is studied. The soil is modelled as a fluid saturated porous continuum. The constitutive behaviour of the solid skeleton is described by the elasto-plastic model of Drucker-Prager. The wave propagation is simulated with a dynamical finite-element program.

A three-field finite element procedure for analysis of elastic wave propagation through fluid-saturated soils

A three-field mixed finite element procedure for the analysis of wave propagation through fluid-saturated porous soils is presented. This approach uses the solid displacement, the fluid displacement relative to the solid and the pore-fluid pressure as the field variables. Thus, a continuous pore pressure field is ensured and pore pressure boundary conditions, e.g., free-draining surfaces can be easily handled. Application of the procedure to a one-dimensional problem shows good agreement with the analytical solution. However, the method is more expensive than the customary two-field formulation using the solid and the relative fluid displacements as the field variables.

Boundary integral equations for the computational modeling of three-dimensional groundwater flow problems

Boundary integral equations for the computational modeling of three-dimensional groundwater flow problems are derived. They follow from appropriate volume and surface source-type integral representations for the pressure and the flow velocity. The numerical handling of the integral equations is discussed in some detail, especially as far as the evaluation of singular integrals is concerned. Arbitrary anisotropy in the resistivity of the fluid-saturated soil is taken into account.

Dynamics of fluid-saturated soils - variational formulation : Sandhu, R S; Hong, S J Int J Num Anal Meth GeomechV11, N3, May–June 1987, P241–255

Dynamics of fluid-saturated soils - variational formulation : Sandhu, R S; Hong, S J Int J Num Anal Meth GeomechV11, N3, May–June 1987, P241–255

飽和層・乾燥層から成る層状地盤の動特性

The method of analysis of soil deposites with fluid saturated soil layer is proposed. Free vibration, frequency response and seismic response of a stratified ground which is composed of two layers-dry soil layer and water contended layer-, are presented and discussed. The ground considered, is assumed to be dry above the water tabel and saturated with water under the level. Eigenvalue analysis for such a ground by using the finite element method is carried out and transfer properties by the wave propagation method are obtained. The numerical results show that the water in the soil deposit deteriorate the ground stiffness and increase the damping properties in shear motion, whereas in the longitudinal motion, the stiffness and damping in the ground are increases. The seismic response analysis of the same soil layer gives the similiar properties in shear motion.