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• W2104345260 abstract "This thesis presents the development of a reactive gas transport equation under coupledframework of thermal, hydraulic, chemical and mechanical (THCM) behaviour of variablysaturated soil. The capabilities of theoretical and numerical modelling of THCM processes havebeen advanced by the successful implementation of various aspects of the new addition. Thepreviously developed THCM model at the Geoenvironmental Research Centre (GRC) has beenextended to include the multicomponent gas transport modelling coupled withchemical/geochemical processes.The mechanisms of advection and diffusion have been considered to define the transport ofmulticomponent gas and chemicals in respective phases as well as exchange via dissolution andexsolution. The governing mass transfer process is subjected to homogeneous and heterogeneousgeochemical reactions under equilibrium condition. Numerical solutions of the governing flowand deformation equations have been achieved by employing finite element method for spatialdiscretisation and finite difference method for temporal discretisation. Advanced geochemicalfeatures of gas-chemical interactions have been incorporated in the transport model, COMPASSby coupling with the geochemical model PHREEQC. A sequential non-iterative approach hasbeen adopted to couple the transport processes and geochemical interactions.Verification of various aspects of the developed gas transfer equation has been commenced via anumber of simulation exercises. Good agreement between the results have been achieved whichsuggests accurate and successful implementation of the theoretical and numerical formulation.The model has been implemented to investigate the gas transport processes in variably saturatedcompacted clay buffers via a number of conceptual simulation scenarios which are representativeof high level nuclear waste disposal. Simulation of gas migration through saturated buffer hasbeen intended to investigate the maximum pressure development as well as the dominant flowmechanisms. Demonstration of the modelling capability in context of reactive gas transport hasbeen carried out considering long term isothermal flow of hydrogen through unsaturated claybuffer. The conclusions drawn from the discussions of simulation results has favoured theunderstanding of some of the key issues associated with gas generation and migration incompacted porous media, particularly, as a case of high level nuclear waste disposal." @default.
• W2104345260 created "2016-06-24" @default.
• W2104345260 creator A5018792806 @default.
• W2104345260 date "2012-01-01" @default.
• W2104345260 modified "2023-09-24" @default.
• W2104345260 title "Modelling of reactive gas transport inunsaturated soil. A coupled thermo-hydro-chemical-mechanical approach" @default.
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