Effect of temperature on the time-dependent behavior of geomaterials

Sheng Zhang; Shuo Xu; Jidong Teng; Yonglin Xiong

doi:10.1016/j.crme.2016.04.005

Effect of temperature on the time-dependent behavior of geomaterials

Sheng Zhang ^1,² ; Shuo Xu ¹ ; Jidong Teng ^1,² ; Yonglin Xiong ³

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

Comptes Rendus. Mécanique, Volume 344 (2016) no. 8, pp. 603-611.

Résumé

In many geotechnical engineering applications, such as nuclear waste disposal and geothermal extraction and storage, it is necessary to consider the long-term mechanical properties. The effect of temperature could have a complicated influence on the creep damage behavior of soft rock. As a consequence, it is meaningful, both in theory and in practice, to establish a constitutive model that can describe the creep damage behavior. Within the framework of continuum mechanics, a thermo-visco-elastoplastic model is proposed on the basis of a sub-loading Cam-clay model and the concept of equivalent stress. Triaxial creep tests under different confining pressures for Tage stone were conducted to validate the proposed model. The experimental results show that an optimum temperature exists for a certain stress state, and this temperature significantly slows down the creep damage rate. In addition, both the retarding and accelerating effects on creep rupture due to limited warming are observed for the same material, and this phenomenon can be predicted well by the proposed model. Finally, a parametric analysis is performed, and the influence of the material parameter on creep regularity is discussed in detail.

Reçu le : 2016-01-19
Accepté le : 2016-04-27
Publié le : 2016-05-24

DOI : 10.1016/j.crme.2016.04.005

Mots clés : Equivalent stress, Creep constitutive model, Creep regularity, Optimum temperature

Affiliations des auteurs :

Sheng Zhang ^{1, 2} ; Shuo Xu ¹ ; Jidong Teng ^{1, 2} ; Yonglin Xiong ³

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     title = {Effect of temperature on the time-dependent behavior of geomaterials},
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Sheng Zhang; Shuo Xu; Jidong Teng; Yonglin Xiong. Effect of temperature on the time-dependent behavior of geomaterials. Comptes Rendus. Mécanique, Volume 344 (2016) no. 8, pp. 603-611. doi : 10.1016/j.crme.2016.04.005. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2016.04.005/

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