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conference paper not in proceedings

A stochastic approach to the modelling of gas transport in bentonite

Madaschi, Aldo  
•
Laloui, Lyesse  
2018
7th International Conference on Unsaturated Soils

In the past years, transport of gases in clay buffer materials for Engineered Barrier Systems (EBS) has been deeply investigated by many research programs in the field of nuclear waste disposal. The phenomenological features of gas transport obtained from experimental tests have been used to define modelling approaches to interpret gas-induced effects in bentonite buffer material. The aim of these models is to analyze the perfor-mance of clay buffer materials in a long term nuclear waste disposal scenario. The gas transport phenomenon is strongly influenced by the microstructural features of the bentonite. In this paper, an advanced finite element approach is used to simulate the gas migration phenomena in the framework of stochastic finite element analy-sis. This tool highlights the most relevant factors affecting the accuracy of the modelling process to improve model efficiency and to estimate the simulation uncertainties. The approach highlights the need of an accurate microstructural characterization of bentonite to define the water retention behavior and the hydraulic response of the buffer material.

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Type
conference paper not in proceedings
Author(s)
Madaschi, Aldo  
•
Laloui, Lyesse  
Date Issued

2018

Total of pages

6

Subjects

bentonite

•

gas transport

•

HM coupling

•

Bayesian approach

Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LMS  
Event nameEvent placeEvent date
7th International Conference on Unsaturated Soils

Hong Kong

August 3-5, 2018

Available on Infoscience
August 20, 2018
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/147872
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