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Coupling of solid deformation and pore pressure for undrained deformation—a discrete element method approach
Author(s) -
Cui Yifei,
Chan Dave,
Nouri Alireza
Publication year - 2017
Publication title -
international journal for numerical and analytical methods in geomechanics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.419
H-Index - 91
eISSN - 1096-9853
pISSN - 0363-9061
DOI - 10.1002/nag.2708
Subject(s) - discrete element method , pore water pressure , isotropy , extended discrete element method , deformation (meteorology) , mechanics , materials science , coupling (piping) , geotechnical engineering , particle (ecology) , porosity , finite element method , effective stress , isotropic solid , contact mechanics , stress (linguistics) , solid mechanics , structural engineering , composite material , engineering , geology , extended finite element method , physics , finite element limit analysis , linguistics , oceanography , philosophy , quantum mechanics
Summary This paper presents a numerical scheme for fluid‐particle coupling that uses the discrete element method by taking into consideration solid deformation and pore pressure generation. A new water particle element is introduced to calculate pore water pressure due to porosity changes. The water particle element has the same size and shape as the solid element and experiences the same amount of deformation. On the basis of the effective stress principle at the element contact, the total force is equal to the sum of the force transmitted through the solid element contact and the water particle force due to pore water pressure. Analytical solutions of traditional soil mechanics problems, such as isotropic compression and consolidated triaxial undrained test, are used to quantitatively validate the proposed model. The numerical results show good agreement between the model and the analytical solutions. The model therefore provides an effective method to calculate pore pressure in a porous medium in discrete modeling.