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Title: Two-dimensional finite element analysis of porous media at multikilobar stress levels
Authors: Laboratory Discretionary Research Program (U.S.)
Akers, Stephen A.
Keywords: Cap model
Finite element method
Effective stress
Porous media
Soil mechanics
Soils testing
Mathematical models
Numerical models
Publisher: Structures Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Technical report (U.S. Army Engineer Waterways Experiment Station) ; SL-93-16.
Description: Technical Report
Abstract: A finite element (FE) code was developed to verify laboratory test results or to predict unavailable laboratory test data for porous media loaded to multikilobar stress levels. The FE code simulates quasi-static, axisymmetric, laboratory mechanical property tests, i.e., the laboratory tests are analyzed as boundary value problems. The code calculates strains, total and effective stresses, and pore fluid pressures for fully and partially saturated porous media. The time-dependent flow of the pore fluid is also calculated. An elastic-plastic strain-hardening cap model calculates the time-independent skeletal responses of the porous solids. This enables the code to model nonlinear irreversible stress-strain behavior and shear-induced volume changes. Fluid and solid compressibilities were incorporated into the code, and partially saturated materials were simulated with a "homogenized" compressible pore fluid. Solutions for several verification problems are given as proof that the program works correctly, and numerical simulations of limestone behavior under drained and undrained boundary conditions are also presented.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Report

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