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Temperature effect on the behaviour of engineered clay barriers

Anh Minh A.M. Tang 
Abstract : The present work deals with the thermo-hydro-mechanical behaviour of compacted swelling clay used for engineered barriers in high-level radioactive repositories. The MX80 bentonite was chosen for this work. Firstly, an experimental work on the thermal conductivity of the compacted bentonite was performed. The results evidenced the effects of dry density, water content, volumetric fraction of soil components, microstructure, and mineralogy. This experimental work gave rise to the proposition of a theoretical model for estimate the thermal conductivity of compacted bentonites. Secondly, after a calibration of suction generated by saturated saline solution in function of temperature, water retention curves were determined at different temperatures. The experimental results showed a decrease of the water retention capacity of soil after heating. A simple model based on the interfacial tension air-water was formulated to simulate this effect. Thirdly, a new isotropic cell enabling a simultaneous control of suction, temperature and mechanical stress was developed. With this new cell, an experimental work on the thermo-mechanical behaviour of the unsaturated compacted bentonite was performed. Finally, a constitutive model was developed for simulate the thermo-hydro-mechanical behaviours obtained experimentally.
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Submitted on : Tuesday, February 7, 2006 - 8:00:00 AM
Last modification on : Monday, October 19, 2020 - 10:54:34 AM
Long-term archiving on: : Thursday, September 30, 2010 - 7:03:21 PM


  • HAL Id : pastel-00001594, version 1



Anh Minh A.M. Tang. Temperature effect on the behaviour of engineered clay barriers. Sciences of the Universe [physics]. Ecole des Ponts ParisTech, 2005. English. ⟨pastel-00001594⟩



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