COUPLED 2025

Multiphysics Modelling of Fracture in Non-Isothermal Multiphase Clayey Soils with the Crack Phase-Field Approach: Preliminary Investigations

  • Sanavia, Lorenzo (University of Padua)
  • Chen, Zechao (Univesity of Padua)
  • De Lorenzis, Laura (ETH Zurich)

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Phase-field modelling has already proved to be a suitable framework to predict the initiation and propagation of drying cracks in variably saturated porous media [1-4]. In this work, we extend the model developed in [1] to non-isothermal conditions, including in the porous media model in [1] a gas phase composed by a mixture of dry air and water vapour. A non-isothermal three phase porous media (solid, liquid and gaseous phases) is then coupled sequentially with a crack phase-field model, according to the numerical strategy formulated in [1]. The degradation of the effective stress is applied, together with the degradation of the capillary pressure accordingly to the finding of [4]. Finite element simulations of desaturation cracks, drying induced cracks and thermal cracks in initially water saturated clayey soils are also shown. . REFERENCES [1] Cajuhi T., L. Sanavia, L. De Lorenzis, Phase-field modeling of fracture in variably saturated porous media. Computational Mechanics 61 (2018), 299-318. [2] Gavagnin C., L. Sanavia, L. De Lorenzis, Stabilized mixed formulation for phase-field computation of deviatoric fracture in elastic and poroelastic materials. Computational Mechanics 65 (2020), 1447–1465. [3] Heider Y., W. Sun, A phase field framework for capillary-induced fracture in unsaturated porous media: Drying-induced vs. hydraulic cracking, Comput. methods Appl. Mech. Engrg. 359 (2020) 112647. [4] Luo C., L. Sanavia, L. De Lorenzis, Phase-field modeling of drying-induced cracks: choice of coupling and study of homogeneous and localized damage. Comput. methods Appl. Mech. Engrg. 410 (2023) 115962, https://doi.org/10.1016/j.cma.2023.115962