Modelling gas fracturing in saturated clay samples using triple-node zero-thickness interface elements

Joaquín Liaudat*, Anne Catherine Dieudonné, Philip J. Vardon

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Geological Disposal Facilities (GDF) for radioactive waste will generally rely on clay-rich materials as a host geological formation and/or engineered barrier. Gas will be produced within the GDF, which can build up significant gas pressure and will activate the migration of gas through the clay materials via different transport mechanisms. These transport mechanisms are usually investigated in laboratory tests on small clay samples of a few centimetres. In this paper, a new Pneumo-Hydro-Mechanical (PHM) Finite Element model to simulate gas migration in saturated clay samples of this scale is presented. In the proposed modelling approach, continuum elements are used to represent the mechanical and flow processes in the bulk clay material, while zero-thickness interface elements are used to represent existing or induced discontinuities (cracks). A new triple-node PHM interface element is presented to achieve this. The performance of model is illustrated with synthetic benchmark examples which show the ability of the model to reproduce observed PHM mechanisms leading to propagation of cracks due to the gas pressure (gas fracturing).

Original languageEnglish
Article number105128
Number of pages18
JournalComputers and Geotechnics
Volume154
DOIs
Publication statusPublished - 2023

Keywords

  • Clay
  • Finite Element Method
  • Gas fracturing
  • Gas migration
  • Interface elements
  • Two-phase flow

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