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An effective stress-based DSC model for predicting the coefficient of lateral soil pressure in unsaturated soils

An effective stress-based DSC model for predicting the coefficient of lateral soil pressure in... In this study, an analytical model is developed to establish a framework for predicting the coefficient of lateral soil pressure in unsaturated soils. To this end, the disturbed state concept (DSC) is implemented along with the concept of effective stress for unsaturated soils. Accordingly, upper and lower limits are considered for the structural disturbance of the soil during hydromechanical loading, and a suction-dependent analytical framework is proposed for calculating continuous variations of the coefficient of lateral soil pressure, from the at-rest to active state of the soil, against the effective vertical stress parameter. The functionality of the proposed model is verified against experimental results obtained from a series of laboratory unsaturated drained tests conducted on two different soil materials (a Sand–Kaolin mixture and Firouzkouh Clay) with two initial void ratios. Quantitative comparisons show excellent conformance between the predicted and experimental data. A practical example of calculating lateral soil pressure on a gravity retaining wall is also presented, in which the results obtained from the model presented in this study and the conventional classic approach of calculating the lateral soil pressure on retaining walls are compared. It is hoped that the results of this study can help researchers and designers to obtain improved values of lateral soil pressure in unsaturated soil. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Acta Geotechnica Springer Journals

An effective stress-based DSC model for predicting the coefficient of lateral soil pressure in unsaturated soils

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References (55)

Publisher
Springer Journals
Copyright
Copyright © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2021
ISSN
1861-1125
eISSN
1861-1133
DOI
10.1007/s11440-021-01376-6
Publisher site
See Article on Publisher Site

Abstract

In this study, an analytical model is developed to establish a framework for predicting the coefficient of lateral soil pressure in unsaturated soils. To this end, the disturbed state concept (DSC) is implemented along with the concept of effective stress for unsaturated soils. Accordingly, upper and lower limits are considered for the structural disturbance of the soil during hydromechanical loading, and a suction-dependent analytical framework is proposed for calculating continuous variations of the coefficient of lateral soil pressure, from the at-rest to active state of the soil, against the effective vertical stress parameter. The functionality of the proposed model is verified against experimental results obtained from a series of laboratory unsaturated drained tests conducted on two different soil materials (a Sand–Kaolin mixture and Firouzkouh Clay) with two initial void ratios. Quantitative comparisons show excellent conformance between the predicted and experimental data. A practical example of calculating lateral soil pressure on a gravity retaining wall is also presented, in which the results obtained from the model presented in this study and the conventional classic approach of calculating the lateral soil pressure on retaining walls are compared. It is hoped that the results of this study can help researchers and designers to obtain improved values of lateral soil pressure in unsaturated soil.

Journal

Acta GeotechnicaSpringer Journals

Published: Dec 1, 2021

Keywords: Analytical model; Disturbed state concept; Effective stress; Experimental verification; Lateral soil pressure; Unsaturated soils

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