Investigation on unsaturated critical state and Hvorslev surface of compacted bentonite under high suction conditions - Archive ouverte HAL
Article Dans Une Revue Engineering Geology Année : 2019

Investigation on unsaturated critical state and Hvorslev surface of compacted bentonite under high suction conditions

N.F. Zhao
  • Fonction : Auteur
Weimin Ye
  • Fonction : Auteur
Chen Bao
  • Fonction : Auteur
Yonggui Chen
  • Fonction : Auteur
Yu-Jun Cui

Résumé

In high-level radioactive waste repositories, compacted bentonite used as buffer/backfill materials should have enough strength and stiffness to enhance the stability of the repository and to protect the waste canisters from the surrounding rock. Therefore, it is essential to understand the strength and deformation behavior of compacted bentonite. In this paper, isotropic loading tests and triaxial shear tests were carried out on unsaturated compacted GMZ bentonite. With the results of compaction and isotropic consolidation tests, the compressibility and yield behavior under isotropic condition were investigated. Based on the results of triaxial shear tests, the stress-strain relationships and dilatancy were analyzed. The overconsolidation ratios for all the specimens were determined. For normal consolidated and lightly overconsolidated soils, existence of a critical state on the compacted GMZ bentonite was confirmed. The evolution of the critical state stress ratio with change of confining pressure was analyzed. For highly overconsolidated soils, the peak strength lies above the CSL. In this regard, the Hvorslev Surface was introduced and related parameters were determined for describing the peak strength of unsaturated highly overconsolidated GMZ bentonite.
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Dates et versions

hal-02499310 , version 1 (05-03-2020)

Identifiants

Citer

N.F. Zhao, Weimin Ye, Chen Bao, Yonggui Chen, Yu-Jun Cui. Investigation on unsaturated critical state and Hvorslev surface of compacted bentonite under high suction conditions. Engineering Geology, 2019, 259, pp.105204. ⟨10.1016/j.enggeo.2019.105204⟩. ⟨hal-02499310⟩
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