This paper presents a general framework for the computational analysis of geo-environmental mechanical problems analysed as multi-physics problems. It is based on a fully coupled heat and multiphase flow model in deforming porous media. The porous medium is assumed to be a multiphase system where interstitial voids of the solid matrix may be filled with water (with dissolved air), water vapour and dry air (or methane). To handle this multiphase system, the general frame of averaging theories is used in deriving the governing equations. The governing equations are derived and then discretized in space and time by means of the finite element method. The numerical examples will show applications of the full set of equations. Examples given concern the simulation of the thermo-hydro-mechanical behaviour of deep nuclear waste disposal in a geological clay formation, the onset of landslides in pyroclastic soils due to rainfal, the groundwater and saturation response of a typical salt marsh of the Venice lagoon (Italy) subjected to both tide fluctuation and flooding and the simulation of a surface subsidence problem due to the production of natural gas.

Multiphysics modelling of environmental engineering problems by means of porous media mechanics

SANAVIA, LORENZO;LUISON, LORIS;NGARADOUMBE NANHORNGUE', RONEL;PASSAROTTO, MAREVA;SANTAGIULIANA, RAFFAELLA;SCHREFLER, BERNHARD
2009

Abstract

This paper presents a general framework for the computational analysis of geo-environmental mechanical problems analysed as multi-physics problems. It is based on a fully coupled heat and multiphase flow model in deforming porous media. The porous medium is assumed to be a multiphase system where interstitial voids of the solid matrix may be filled with water (with dissolved air), water vapour and dry air (or methane). To handle this multiphase system, the general frame of averaging theories is used in deriving the governing equations. The governing equations are derived and then discretized in space and time by means of the finite element method. The numerical examples will show applications of the full set of equations. Examples given concern the simulation of the thermo-hydro-mechanical behaviour of deep nuclear waste disposal in a geological clay formation, the onset of landslides in pyroclastic soils due to rainfal, the groundwater and saturation response of a typical salt marsh of the Venice lagoon (Italy) subjected to both tide fluctuation and flooding and the simulation of a surface subsidence problem due to the production of natural gas.
2009
XIX Congresso AIMETA Associazione Italiana di Meccanica Teorica e Applicata
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/2439507
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