Transient temperature and water distributions in unconstrained compacted granular bentonite under elevated temperatures

IF 3.3 2区工程技术 Q3 ENERGY & FUELS

Geomechanics for Energy and the Environment Pub Date : 2024-12-15 DOI:10.1016/j.gete.2024.100626

Yu Lu, John S. McCartney

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引用次数: 0

Abstract

This paper focuses on understanding transient temperature and water redistributions in compacted bentonite under thermal gradients in high-level nuclear waste disposal repository, particularly during the initial drying of granular bentonite with localized water content and volume changes near the canister. One-dimensional heating tests were conducted to investigate the coupled thermo-hydro-mechanical response of compacted granular MX80 bentonite layers under unconstrained and globally constant water content conditions during basal heating, encompassing both prolonged heating processes followed by natural cooling. Measurements of the transient temperature and volumetric water content redistributions at different vertical distances from the basal heating plate under high-temperature gradients and the global volumetric strains reveal varying rates of heat transfer and water vapor diffusion processes and associated volume change. A hysteretic relationship between volumetric water content and soil temperature during heating and cooling was found to be linked to soil water retention mechanisms. Temperature and water content relationships with local axial strains were found to be useful in evaluating density gradient changes that may occur near the canister.

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来源期刊

Geomechanics for Energy and the Environment Earth and Planetary Sciences-Geotechnical Engineering and Engineering Geology

CiteScore

5.90

自引率

11.80%

发文量

期刊介绍： The aim of the Journal is to publish research results of the highest quality and of lasting importance on the subject of geomechanics, with the focus on applications to geological energy production and storage, and the interaction of soils and rocks with the natural and engineered environment. Special attention is given to concepts and developments of new energy geotechnologies that comprise intrinsic mechanisms protecting the environment against a potential engineering induced damage, hence warranting sustainable usage of energy resources. The scope of the journal is broad, including fundamental concepts in geomechanics and mechanics of porous media, the experiments and analysis of novel phenomena and applications. Of special interest are issues resulting from coupling of particular physics, chemistry and biology of external forcings, as well as of pore fluid/gas and minerals to the solid mechanics of the medium skeleton and pore fluid mechanics. The multi-scale and inter-scale interactions between the phenomena and the behavior representations are also of particular interest. Contributions to general theoretical approach to these issues, but of potential reference to geomechanics in its context of energy and the environment are also most welcome.