A thermo-elastoplastic model for soft rocks considering structure

Zuoyue He; Sheng Zhang; Jidong Teng; Yonglin Xiong

doi:10.1016/j.crme.2017.07.002

A thermo-elastoplastic model for soft rocks considering structure

Zuoyue He ^1,² ; Sheng Zhang ^1,² ; Jidong Teng ^1,² ; Yonglin Xiong ³

¹ National Engineering Laboratory for High-Speed-Railway Construction, Central South University, China
² School of Civil Engineering, Central South University, Changsha 410075, China
³ State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China

Comptes Rendus. Mécanique, Volume 345 (2017) no. 11, pp. 752-763.

Résumé

In the fields of nuclear waste geological deposit, geothermy and deep mining, the effects of temperature on the mechanical behaviors of soft rocks cannot be neglected. Experimental data in the literature also showed that the structure of soft rocks cannot be ignored. Based on the superloading yield surface and the concept of temperature-deduced equivalent stress, a thermo-elastoplastic model for soft rocks is proposed considering the structure. Compared to the superloading yield surface, only one parameter is added, i.e. the linear thermal expansion coefficient. The predicted results and the comparisons with experimental data in the literature show that the proposed model is capable of simultaneously describing heat increase and heat decrease of soft rocks. A stronger initial structure leads to a greater strength of the soft rocks. Heat increase and heat decrease can be converted between each other due to the change of the initial structure of soft rocks. Furthermore, regardless of the heat increase or heat decrease, a larger linear thermal expansion coefficient or a greater temperature always leads to a much rapider degradation of the structure. The degradation trend will be more obvious for the coupled greater values of linear thermal expansion coefficient and temperature. Lastly, compared to heat decrease, the structure will degrade more easily in the case of heat increase.

Reçu le : 2017-04-01
Accepté le : 2017-07-04
Publié le : 2017-08-18

DOI : 10.1016/j.crme.2017.07.002

Mots clés : Soft rocks, Temperature, Linear thermal expansion coefficient, Structure, Elasto-plastic

Affiliations des auteurs :

Zuoyue He ^{1, 2} ; Sheng Zhang ^{1, 2} ; Jidong Teng ^{1, 2} ; Yonglin Xiong ³

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     title = {A thermo-elastoplastic model for soft rocks considering structure},
     journal = {Comptes Rendus. M\'ecanique},
     pages = {752--763},
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     number = {11},
     year = {2017},
     doi = {10.1016/j.crme.2017.07.002},
     language = {en},
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Zuoyue He; Sheng Zhang; Jidong Teng; Yonglin Xiong. A thermo-elastoplastic model for soft rocks considering structure. Comptes Rendus. Mécanique, Volume 345 (2017) no. 11, pp. 752-763. doi : 10.1016/j.crme.2017.07.002. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2017.07.002/

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