Fully Coupled Finite Element Analysis for Consolidation of Unsaturated Soils Due to Hydraulic and Mechanical Loads

Zhang, W and Zhou, A 2018, 'Fully Coupled Finite Element Analysis for Consolidation of Unsaturated Soils Due to Hydraulic and Mechanical Loads', in Laureano R. Hoyos, John S. McCartney, Sandra L. Houston, William J. Likos (ed.) Proceedings of the Second Pan-American Conference on Unsaturated Soils, Dallas, Texas, United States, 12-15 November 2017, pp. 205-214.


Document type: Conference Paper
Collection: Conference Papers

Title Fully Coupled Finite Element Analysis for Consolidation of Unsaturated Soils Due to Hydraulic and Mechanical Loads
Author(s) Zhang, W
Zhou, A
Year 2018
Conference name Second Pan-American Conference on Unsaturated Soils
Conference location Dallas, Texas, United States
Conference dates 12-15 November 2017
Proceedings title Proceedings of the Second Pan-American Conference on Unsaturated Soils
Editor(s) Laureano R. Hoyos, John S. McCartney, Sandra L. Houston, William J. Likos
Publisher American Society of Civil Engineers
Place of publication Reston, Virginia, United States
Start page 205
End page 214
Total pages 10
Abstract A constitutive model of unsaturated soils, referred as the σ′-S model (Zhou et al. 2012a, b), is implemented into finite elements to conduct fully coupled consolidation analyses for unsaturated soils subjected to various hydraulic and mechanical loads. The general form of the constitutive equations is derived for the net stress update, where the suction (s) is treated as a strain variable whereas the degree of saturation (Sr) is treated as a stress variable, and the hydraulic hysteresis and fully coupled hydro-mechanical interaction are considered. An explicit integration scheme is adopted to integrate the stress-strain-pore pressure-degree of saturation relationships (σ-ε-uw-Sr) of the constitutive equations. The finite element implementation is then validated against Terzaghis analytical consolidation solution for the saturated condition. Several one-dimensional consolidation and infiltration scenarios for different soils (hypothesis sand, silt, and clay) due to various mechanical and hydraulic loads are analysed by using the developed finite element codes, including a slow drying-wetting circle, and a fast loading with a pore pressure dissipation process after slow drying.
Subjects Civil Geotechnical Engineering
DOI - identifier 10.1061/9780784481684.022
Copyright notice Copyright © 2018 by the American Society of Civil Engineers. All Rights Reserved.
ISBN 9780784481684
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