Journal
COMPUTERS AND GEOTECHNICS
Volume 133, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compgeo.2021.104020
Keywords
Porothermoelasticity theory; Thermal-hydraulic-mechanical system; Thermally uncoupled model; Sensitivity analysis; Stochastic analysis
Categories
Funding
- Taiwan Power Company (TPC) [TPC-541-102-901001]
- Institute of Nuclear Energy Research (INER), Taiwan [NL1030147]
- Ministry of Science and Technology (MOST), Taiwan [MOST 106-2116-M-008-023-MY3, MOST 108-2638-E-008-001-MY2, MOST 110-2623-E008-004-NU]
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The fundamental study of coupled thermal-hydraulic-mechanical systems is crucial in multiphysical fields. Results indicate that the size scale of the domain and THM properties are important factors in the coupled THM system.
The fundamental study of coupled thermal?hydraulic-mechanical (THM) systems is an important issue in multiphysical fields. This study developed a THM model in which the hydraulic and mechanical effects are fully coupled and the temperature change serves as the perturbation source of the system. A porothermoelasticity model was applied to investigate the cross-interactions among the temperature, change in pore water pressure, and displacement of a buffer material in the near-field and a host rock in the far-field with the conceptual model in a nuclear waste repository. The results show that the size scale of the domain of interest and the THM properties play important roles in the coupled THM system. The changes in pore water pressure depended on the combined effect of the deformation of the porous space and pore water controlled by the thermal expansion coefficients of the solids and fluids. Stochastic analyses show that the uncertainties of variables varied spatiotemporally due to the thermal influences and approached zero due to the presence of a stable condition. The cross-interactions between displacement and change in pore water pressure induced by the thermal effect were complex and can be determined from statistical moment analyses.
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