TY - JOUR
T1 - Model for coupled large strain consolidation and solute transport in layered soils
AU - Pu, Hefu
AU - Fox, Patrick J.
N1 - Funding Information:
Financial support for this investigation was provided by Grant numbers CMMI-1001023 and CMMI-1363230 from the U.S. National Science Foundation. This support is gratefully acknowledged.
Publisher Copyright:
© 2015 American Society of Civil Engineers.
PY - 2016/4/1
Y1 - 2016/4/1
N2 - A numerical model, called CST3 (Consolidation and Solute Transport 3), is presented for coupled one-dimensional large strain consolidation and solute transport in layered soils. The consolidation algorithm accounts for vertical strain, soil self-weight, general constitutive relationships, relative velocity of fluid and solid phases, changing compressibility and hydraulic conductivity during consolidation, unload/reload, time-dependent loading and boundary conditions, external hydraulic gradient, variable preconsolidation stress profiles, and multiple soil layers with different material properties. The solute transport algorithm accounts for advection, diffusion, mechanical dispersion, linear and nonlinear sorption, equilibrium and nonequilibrium sorption, porosity-dependent effective diffusion coefficient, and first-order decay reactions. CST3 is based on a dual-Lagrangian framework that separately tracks the motions of fluid and solid phases. The development of CST3 is first described, followed by verification checks. Numerical simulations indicate that layered soil heterogeneity and preconsolidation stress can have important effects on consolidation-induced solute transport behavior. Failure to correctly account for soil heterogeneity or preconsolidation stress profile can lead to significant errors in the analysis of consolidation and solute transport in layered soils.
AB - A numerical model, called CST3 (Consolidation and Solute Transport 3), is presented for coupled one-dimensional large strain consolidation and solute transport in layered soils. The consolidation algorithm accounts for vertical strain, soil self-weight, general constitutive relationships, relative velocity of fluid and solid phases, changing compressibility and hydraulic conductivity during consolidation, unload/reload, time-dependent loading and boundary conditions, external hydraulic gradient, variable preconsolidation stress profiles, and multiple soil layers with different material properties. The solute transport algorithm accounts for advection, diffusion, mechanical dispersion, linear and nonlinear sorption, equilibrium and nonequilibrium sorption, porosity-dependent effective diffusion coefficient, and first-order decay reactions. CST3 is based on a dual-Lagrangian framework that separately tracks the motions of fluid and solid phases. The development of CST3 is first described, followed by verification checks. Numerical simulations indicate that layered soil heterogeneity and preconsolidation stress can have important effects on consolidation-induced solute transport behavior. Failure to correctly account for soil heterogeneity or preconsolidation stress profile can lead to significant errors in the analysis of consolidation and solute transport in layered soils.
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U2 - 10.1061/(ASCE)GM.1943-5622.0000539
DO - 10.1061/(ASCE)GM.1943-5622.0000539
M3 - Article
AN - SCOPUS:84960824935
VL - 16
JO - International Journal of Geomechanics
JF - International Journal of Geomechanics
SN - 1532-3641
IS - 2
M1 - 04015064
ER -