The mechanisms controlling the movement of gases through geological disposal facilities can be described by models accounting for (i) diffusion, (ii) two-phase flow, (iii) localised flow pathways and (iv) gas fracturing of the rock. It is therefore necessary to consider all these phenomena for a better understanding of the processes governing the movement of gases in low permeability materials. The purpose of Task A in the current phase of the DEvelopment of COupled models and their VALidation against Experiments (DECOVALEX) project is to better understand the processes governing the advective movement of gas. In this paper, a synthesis of the ongoing work of eight participating modelling teams is presented. A wide range of 2D and 3D approaches including (i) continuous strategies assuming different mechanical deformation behaviors, (ii) continuous models with distinct phases or embedded fractures and (iii) discrete models with different formulations are validated against a gas flow test on pre-compacted bentonite undertaken by the British Geological Survey. The results of the ongoing work show that after a calibration process, plausible descriptions of the laboratory experiment can be achieved.
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2nd International Discrete Fracture Network Engineering Conference
June 20–22, 2018
Seattle, Washington, USA
Numerical Modelling of Gas Flow in a Compact Clay Barrier for DECOVALEX-2019
Elena Tamayo-Mas;
Elena Tamayo-Mas
British Geological Survey
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Hua Shao;
Hua Shao
Federal Institute for Geosciences and Natural Resources
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Elias Dagher;
Elias Dagher
Canadian Nuclear Safety Commission / University of Ottawa
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Jaewon Lee;
Jaewon Lee
Korea Atomic Energy Research Institute
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Kunhwi Kim;
Kunhwi Kim
Lawrence Berkeley National Laboratory
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Jonny Rutqvist;
Jonny Rutqvist
Lawrence Berkeley National Laboratory
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Ivan Damians;
Ivan Damians
Universitat Politecnica de Catalunya
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Sebastia Olivella
Sebastia Olivella
Universitat Politecnica de Catalunya
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Paper presented at the 2nd International Discrete Fracture Network Engineering Conference, Seattle, Washington, USA, June 2018.
Paper Number:
ARMA-DFNE-18-0623
Published:
June 20 2018
Citation
Tamayo-Mas, Elena, Harrington, Jon, Shao, Hua, Dagher, Elias, Lee, Jaewon, Kim, Kunhwi, Rutqvist, Jonny, Lai, Shu-Hua, Chittenden, Neil, Wang, Yifeng, Damians, Ivan, and Sebastia Olivella. "Numerical Modelling of Gas Flow in a Compact Clay Barrier for DECOVALEX-2019." Paper presented at the 2nd International Discrete Fracture Network Engineering Conference, Seattle, Washington, USA, June 2018.
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