A fully coupled particle method for dynamic analysis of saturated soil

Among other numerical issues, it is well known that the finite element method (FEM) lacks objectivity in reproducing high deformation rates due to extreme external actions. In geotechnical applications, the coupling of large solid deformations with the pore fluid flow is a critical subject, being on...

Full description

Saved in:

Bibliographic Details
Published in:	Computational particle mechanics Vol. 8; no. 4; pp. 845 - 857
Main Authors:	Mroginski, J. L., Castro, H. G., Podestá, J. M., Beneyto, P. A., Anonis, A. R.
Format:	Journal Article
Language:	English
Published:	Cham Springer International Publishing 01-07-2021 Springer Nature B.V
Subjects:	Classical and Continuum Physics Computational fluid dynamics Computational Science and Engineering Deformation Engineering Finite element method Fluid flow Kinematics Levees Mathematical models Numerical methods Pore water pressure Porous media Porous media flow Quadratures Robustness (mathematics) Saturated soils Soil analysis Soil dynamics Soil water Theoretical and Applied Mechanics Saturated soils Stability analysis Explicit techniques Particle methods
Online Access:	Get full text
Tags:	Add Tag No Tags, Be the first to tag this record!

Description
Summary:	Among other numerical issues, it is well known that the finite element method (FEM) lacks objectivity in reproducing high deformation rates due to extreme external actions. In geotechnical applications, the coupling of large solid deformations with the pore fluid flow is a critical subject, being one of the multiple scenarios where FEM could have restricted applications. In order to overcome the aforementioned numerical drawbacks, the generic theoretical approach presented in this work is implemented in the context of an explicit numerical method known as the material point method (MPM). Since the MPM can be viewed as a special Lagrangian FEM with particle quadrature and continuous mesh updating, the improved formulation and numerical implementation presented here are well suited for the study of coupled water pore pressure and soil deformation models. One important aspect of the presented coupled formulation is the assumption of two independent sets of Lagrangian material points for each phase. This characteristic leads to a numerical tool oriented to large deformations simulations in saturated porous media, with a fully coupled thermodynamically consistent formulation. To illustrate its robustness and accuracy, the approach is applied to two different real engineering applications: progressive failure modeling of a granular slope and river levees. The obtained results show that the physics of fluid flow through porous media is adequately represented in each analyzed case. It is also proved that it accurately represents the kinematics of soil skeleton and water phase for fully saturated cases, ensuring mass conservation of all constituents.
ISSN:	2196-4378 2196-4386
DOI:	10.1007/s40571-020-00373-y