A constitutive model for gassy clay

Gao, Z. , Cai, H., Hong, Y. and Lu, D. (2021) A constitutive model for gassy clay. Canadian Geotechnical Journal, (doi: 10.1139/cgj-2020-0754) (Early Online Publication)

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Abstract

Fine-grained marine sediments often contain gas bubbles that can cause many geotechnical problems. This soil has a composite structure with gas bubbles fitting within the saturated soil matrix. The gas cavity has a detrimental effect on the soil stiffness and strength when they are filled with undissolved gas only. The gas cavity can be filled with gas and pore water due to ‘bubble flooding’. Bubble flooding has a beneficial effect on the soil stiffness and undrained shear strength because it makes the saturated soil matrix partially drained under a globally undrained condition. A critical state constitutive model for gassy clay is presented which accounts for the composite structure of the soil and bubble flooding. The gas cavity is assumed to have a detrimental effect on the plastic hardening of the saturated soil matrix. Some of the bubbles can be flooded by pore water from the saturated soil matrix which leads to higher mean effective stress of the saturated soil matrix. Consequently, both soil stiffness and strength increase. Only one new parameter is introduced to model the detrimental effect of gas bubbles on plastic hardening. The model has been validated by the results of three gassy clays.

Item Type:Articles
Status:Early Online Publication
Refereed:Yes
Glasgow Author(s) Enlighten ID:Cai, Hongjian and Gao, Dr Zhiwei
Authors: Gao, Z., Cai, H., Hong, Y., and Lu, D.
College/School:College of Science and Engineering > School of Engineering > Infrastructure and Environment
Journal Name:Canadian Geotechnical Journal
Publisher:NRC Research Press
ISSN:0008-3674
ISSN (Online):1208-6010
Published Online:08 October 2021
Copyright Holders:Copyright © 2021 NRC Research Press
First Published:First published in Canadian Geotechnical Journal 2021
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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