A chemo-elastic-plastic model for unsaturated expansive clays

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• 作者：Xiaoqin Lei^a ; ^b ; ^d ; Henry Wong^b ; ^{kwaikwan.wong@entpe.fr" class="auth_mail" title="E-mail the corresponding author} ; ^{wongkwaikwan@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Antonin Fabbri^b ; Ali Limam^a ; Y.M. Cheng^c
• 关键词：Chemo-mechanical coupling ; Elastic-plasticity ; Unsaturated soil ; Expansive clay ; Double structure
• 刊名：International Journal of Solids and Structures
• 出版年：2016
• 出版时间：15 June 2016
• 年：2016
• 卷：88-89
• 期：Complete
• 页码：354-378
• 全文大小：4488 K

文摘

Clays are widely used as sealing materials in various geotechnical and geo-environmental engineering applications. These clays are usually unsaturated and are sensitive to chemical composition of the saturating solutions. During their service period, various mechanical, chemical, and hydraulic loading conditions, usually coupled with each other, can be encountered. It is necessary to use a chemo-elastic–plastic unsaturated model to account for these coupled loading paths and simulate the possible behaviours of these clays in their realistic engineering context. In this paper, based on the thermodynamic framework (Lei et al., 2014) for unsaturated expansive clays, the chemo-elastic–plastic model developed by Loret et al. (2002) for saturated homoionic expansive clays is extended to the general unsaturated case. From a theoretical analysis, it is shown that this model is sufficient to simulate the typical behaviours under various mechanical, chemical, and hydraulic loading conditions. The model is then validated against available experimental data of oedometer tests concerning purely mechanical and mixed chemo-mechanical loadings under controlled matric suction on reconstituted Boom Clay mixed with NaNO₃ solution. Reasonably accurate estimates of quantitative responses of these complex coupled geochemical loading paths can be obtained, thus giving us a preliminary insight on chemo-hydro-mechanical coupled behaviours.