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Multiscale Modeling of Environment-Dependent Heterogeneous Porous Media by a Thermo-Hydro-Mechanical Damage Model

SSRN, ISSN: 1556-5068
2023
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Article Description

Evaluating the combined environmental effects, such as external loads, water saturation, and thermal variations, on the mechanical performance of porous media is a challenge, mainly due to its inherent heterogeneity and complex multi-physical field coupling mechanisms. This study pioneers the development of a multiscale thermo-hydro-mechanical damage modeling framework to investigate environment-dependent heterogeneous porous media, with a specific focus on pavement infrastructure. The notable features of this framework comprise: (1) introducing an upscaling homogenization method to connect material properties across various scales while considering seasonal variations, (2) creating a downscaling transfer procedure to translate structural responses from macroscopic to mesoscopic scales, providing insights into their multiphysics mechanisms, and (3) proposing a new sequential coupled algorithm in multiscale simulations for comprehensive multi-field coupling calculations. The key findings demonstrated that under hydro-thermo-mechanical loading, shear transverse damage occurs mainly at the macro media surface, while tension longitudinal cracks appear at the bottom of the mesoscale material layer. Damage patterns vary with seasons, with more shear damage prevalent during the summer and an increased occurrence of tension cracks during the winter. Additionally, water-saturated media are more susceptible to down-top cracking compared to dry ones. The proposed model can be easily extended to investigate the mechanical behaviors of various heterogeneous porous media under a range of environmental conditions.

Bibliographic Details

Mingyang Gong; Zhen Leng; Binbin Yin

Elsevier BV

Multidisciplinary; Multiscale modeling; Thermo-hydro-mechanical model; Homogenization method; Mesoscale damage; Heterogeneous porous media

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