Numerical modeling of coupled thermal-hydro-mechanical behavior of GMZ bentonite in the China-Mock-up test

[en] Gaomiaozi (GMZ) bentonite is currently considered as themost suitable buffermaterial for high-level radioactive waste geological repository in China. To investigate the long-term performance of GMZ bentonite under repository conditions, a large scale mock-up test has been carried out since 2011. In the test, a hydration systemand an electrical heater were employed to simulate the Thermal-Hydro-Mechanical (THM) coupled conditions near a repository. In this work, a numerical study is performed to reproduce the experimental data obtained in the first three years of the China-Mock-up experiment. The principle THM characteristics and parameters of the bentonite are presented. On this basis, a THM coupled constitutive model is introduced. With the proposed model, numerical simulations of the China-Mock-up test are carried out using LAGAMINE. The numerical data of temperature, relative humidity, and swelling pressure of the GMZ compacted bentonite are compared with the experimental ones.We discuss the effect of the balance between the drying effect and water penetration process on the THM behavior of the GMZ bentonite. The good agreement between the predicted and experimental results suggests that the proposed model can reproduce the fundamental behavior of GMZ compacted bentonite under coupled THM conditions.

Disciplines :

Civil engineering

Author, co-author :

Zhao, Jingbo; BRIUG

Chen, Liang; BRIUG

Collin, Frédéric ; Université de Liège > Département ArGEnCo > Géotechnique

Liu, Yuemiao; BRIUG

Wang, Ju; BRIUG

Language :

English

Title :

Numerical modeling of coupled thermal-hydro-mechanical behavior of GMZ bentonite in the China-Mock-up test

Publication date :

November 2016

Journal title :

Engineering Geology

ISSN :

0013-7952

Publisher :

Elsevier Science, Amsterdam, Netherlands

Volume :

214

Pages :

116-126

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 03 November 2016

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