From saturated to unsaturated conditions and vice-versa

Lloret-Cabot, M. , Wheeler, S. J. , Pineda, J. A., Romero, E. and Sheng, D. (2018) From saturated to unsaturated conditions and vice-versa. Acta Geotechnica, 13(1), pp. 15-37. (doi: 10.1007/s11440-017-0577-6)

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Representing transitions between saturated and unsaturated conditions, during drying, wetting and loading paths, is a necessary step for a consistent unification between saturated and unsaturated soil mechanics. Transitions from saturated to unsaturated conditions during drying will occur at a nonzero air-entry value of suction, whereas transitions from unsaturated to saturated conditions during wetting or loading will occur at a lower nonzero air-exclusion value of suction. Air-entry and air-exclusion values of suction for a given soil will differ (representing hysteresis in the retention behaviour) and both are affected by changes in the dry density of the soil or by the occurrence of plastic volumetric strains. The paper demonstrates, through model simulations and comparison with experimental data from the literature (covering drying, wetting and loading tests), that the Glasgow Coupled Model (GCM), a coupled elasto-plastic constitutive model covering both mechanical and retention behaviour, represents transitions between unsaturated and saturated behaviour in a consistent fashion. Key aspects of the GCM are the use of Bishop’s stress tensor for mechanical behaviour, the additional influence of degree of saturation on mechanical yielding, inclusion of hysteresis in the retention behaviour, and the role of plastic volumetric strains (and not total volumetric strains) in the description of the water retention response. The success of the GCM in representing consistently transitions between saturated and unsaturated conditions, together with subsequent mechanical and retention responses, demonstrates the potential of this coupled constitutive model for numerical modelling of boundary value problems involving saturated and unsaturated conditions.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Wheeler, Professor Simon and Lloret-Cabot, Dr Marti
Authors: Lloret-Cabot, M., Wheeler, S. J., Pineda, J. A., Romero, E., and Sheng, D.
College/School:College of Science and Engineering > School of Engineering > Infrastructure and Environment
Journal Name:Acta Geotechnica
ISSN (Online):1861-1133
Published Online:05 August 2017
Copyright Holders:Copyright © 2017 The Authors
First Published:First published in Acta Geotechnica 13(1):15-37
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
717661COUPLEDSimon WheelerEuropean Commission (EC)706712ENG - ENGINEERING INFRASTRUCTURE & ENVIR
742381TERRESimon WheelerEuropean Commission (EC)675762ENG - ENGINEERING INFRASTRUCTURE & ENVIR