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Rainfall induced deformation on unsaturated collapsible soils

Moghaddasi, Hamed; Osman, Ashraf; Toll, David; Khalili, Nasser

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Authors

Hamed Moghaddasi

David Toll

Nasser Khalili



Contributors

E Tutumluer
Editor

S NazarianImad
Editor

A Qamhia
Editor

Abstract

The stability of transportation infrastructure can be affected by seasonal rainfall infiltrated adjacent excavations and natural slopes. The paper investigates the rainfall-induced deformation of an anchored excavation constructed in unsaturated soils. An advanced constitutive model based on the theory of bounding surface plasticity is employed to predict the behaviour of partially saturated soils. The collapse characteristics of unsaturated soils due to wetting are captured in the model by introducing a suction-dependent hardening law. The proposed model has been implemented in a finite difference code with a two-phase flow and deformation formulation. In the numerical algorithms, the validity of the effective stress principle in unsaturated soils is emphasized and the coupling between various phases of porous media has been considered. The problem of an anchored excavation subjected to rainfall is then simulated with the implemented model. The lateral deformation of the supported excavation during the infiltration of water into unsaturated collapsible soils is obtained and compared with the case where the plastic collapse is prevented. Finally, the effect of anchors on minimizing and changing the mode of the deformation is explored.

Citation

Moghaddasi, H., Osman, A., Toll, D., & Khalili, N. (2022). Rainfall induced deformation on unsaturated collapsible soils. In E. Tutumluer, S. NazarianImad, & A. Qamhia (Eds.), Advances in Transportation Geotechnics IV (447-456). https://doi.org/10.1007/978-3-030-77238-3_34

Conference Name Proceedings of the 4th International Conference on Transportation Geotechnics
Conference Location Chicago, Illinois, on 23-26 May 2021
Online Publication Date Sep 17, 2021
Publication Date 2022
Deposit Date Jan 15, 2022
Publicly Available Date Sep 17, 2022
Publisher Springer Verlag
Volume 166
Pages 447-456
Series Title Lecture Notes in Civil Engineering
Book Title Advances in Transportation Geotechnics IV
ISBN 9783030772376
DOI https://doi.org/10.1007/978-3-030-77238-3_34
Public URL https://durham-repository.worktribe.com/output/1137834

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