Inclusion of chemical effect in a fully coupled THM finite element code

Ayman Abed, Wojciech Tomasz Sołowski, Enrique Romero, Antonio Gens

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

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Abstract

Bentonite-rich clays can be used as a buffer / backfill material in deep geological repositories for nuclear waste. The prediction of the long-term performance of a buffer / backfill in such a complex environment, where the temperature, humidity and chemistry of water change, requires a fully thermo-hydro-mechanical-chemical (THMC) coupled numerical code. This paper presents a simple extension of a THM coupled finite element code to include chemical effects. After deriving the governing salt mass balance equation and discussing its implementation into the code, the paper verifies the extended framework against analytical solution for 1D salt transport. In addition, the article presents a validation example in which the code replicates experimental data. The numerical results obtained from the extended THMC coupled finite element code encourage further investigation of the chemical effects on the mechanical and thermal behaviour of the material. That would serve the ultimate goal of achieving a safer design of the nuclear waste storage facility.
Original languageEnglish
Title of host publicationUnsaturated Soils
EditorsCharles Ng, Anthony Leung, Abraham Chiu, Chao Zhou
Place of PublicationHong Kong
PublisherThe Hong Kong University of Science and Technology
Pages827-832
Number of pages6
Volume2
ISBN (Print)978-988-78037-3-7, 978-988-14032-2-3
Publication statusPublished - 2018
MoE publication typeA4 Article in a conference publication
EventInternational Conference on Unsaturated Soils - Hong Kong, Hong Kong
Duration: 3 Aug 20185 Aug 2018
Conference number: 7

Conference

ConferenceInternational Conference on Unsaturated Soils
Abbreviated titleUNSAT
CountryHong Kong
CityHong Kong
Period03/08/201805/08/2018

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