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Dilatant hardening of fluid‐saturated sandstone
Author(s) -
Makhnenko Roman Y.,
Labuz Joseph F.
Publication year - 2015
Publication title -
journal of geophysical research: solid earth
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.983
H-Index - 232
eISSN - 2169-9356
pISSN - 2169-9313
DOI - 10.1002/2014jb011287
Subject(s) - dilatant , geotechnical engineering , poromechanics , hardening (computing) , plane stress , geology , constitutive equation , strain hardening exponent , pore water pressure , porosity , deformation (meteorology) , materials science , porous medium , composite material , thermodynamics , finite element method , layer (electronics) , physics
The presence of pore fluid in rock affects both the elastic and inelastic deformation processes, yet laboratory testing is typically performed on dry material even though in situ the rock is often saturated. Techniques were developed for testing fluid‐saturated porous rock under the limiting conditions of drained, undrained, and unjacketed response. Confined compression experiments, both conventional triaxial and plane strain, were performed on water‐saturated Berea sandstone to investigate poroelastic and inelastic behavior. Measured drained response was used to calibrate an elasto‐plastic constitutive model that predicts undrained inelastic deformation. The experimental data show good agreement with the model: dilatant hardening in undrained triaxial and plane strain compression tests under constant mean stress was predicted and observed.