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Modeling the static liquefaction of unsaturated sand containing gas bubbles

Lü, Xilin and Huang, Maosong and Andrade, José E. (2018) Modeling the static liquefaction of unsaturated sand containing gas bubbles. Soils and Foundations, 58 (1). pp. 122-133. ISSN 0038-0806.

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As a modification of the deviatoric hardening plasticity model, a material state-dependent model was proposed to simulate the response of unsaturated sand containing gas bubbles under undrained triaxial conditions. Affected by the compressibility of gas, the stress paths under undrained conditions approach the drained response of sand when the initial degree of saturation is low. Upon an increase in the degree of saturation, the stress path gradually approaches the saturated undrained response. According to the prediction based on the second-order work criterion, static liquefaction occurs in loose sand, but not in dense sand. Increases in the degree of saturation and the initial gas pressure reduce the stress ratio at the instability points. The instability line obtained by connecting those instability points in the p-q space is nonlinear, and its slope depends on the initial void ratio, the initial degree of saturation, the initial gas pressure, and the confining stress. After comparing the experimental results in the literature with the theoretical prediction, the proposed model was shown to precisely predict the onset of the static liquefaction of unsaturated sand containing gas bubbles.

Item Type:Article
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Lü, Xilin0000-0003-1045-6047
Additional Information:© 2018 Production and hosting by Elsevier B.V. on behalf of The Japanese Geotechnical Society. Received 15 December 2016, Revised 8 October 2017, Accepted 18 October 2017, Available online 12 February 2018.
Subject Keywords:Static liquefaction; Unsaturated sand; Gas pressure; Material state; Second-order work criterion
Issue or Number:1
Record Number:CaltechAUTHORS:20180425-130259176
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Official Citation:Xilin Lü, Maosong Huang, José E. Andrade, Modeling the static liquefaction of unsaturated sand containing gas bubbles, Soils and Foundations, Volume 58, Issue 1, 2018, Pages 122-133, ISSN 0038-0806, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:86035
Deposited By: Tony Diaz
Deposited On:25 Apr 2018 21:26
Last Modified:09 Mar 2020 13:19

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