Study of the hydro-mechanical-damage coupled creep constitutive model of mudstone, Part II: Numerical algorithm and parameter inversion

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Abstract

Further analysis is performed on hydro-mechanical-damage coupled creep constitutive model of mudstone proposed by authors in part one (Rock and Soil Mechanics, 2011, 32(9): 2596-2601). Based on the continuum damage mechanics and Biot theory, the finite element equations of creep damage model are derived by considering the hydro-mechanical-damage coupling. A nonlinear finite element analysis program is developed based on the four-step numerical algorithm: i.e. elastic predictor-plastic corrector-damage corrector-permeability corrector. The developed numerical tool was applied to the analysis of the long term HM behaviour of the Boom clay around the Test Drift of URL HADES in Belgium. The unknown parameters of Boom clay are acquired by the method of displacement back analysis based on the in-situ lining deformation for about 20 years. The hydro-mechanical coupling process, the evolution of damage and the long term stability of the surrounding rock, the excavation induced permeability variation and subsequent self-sealing processes are studied by the proposed models.

Details

Original languageEnglish
Pages (from-to)3163-3170
JournalRock and Soil Mechanics
Volume32
Issue number10
Publication statusPublished - Oct 2011

Keywords

  • mudstone, constitutive model, damage mechanics, hydro-mechanical coupling, finite elements, inversion

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