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Modeling of Non‐Isothermal THM Coupled Processes In Multi‐Phase Porous Media
The present work focuses on the finite element simulation of thermal hydraulic and mechanical (THM) processes in porous media. As a representative case, we investigate such coupled processes in the FEBEX type nuclear repository, which is built deep underground fully in saturated rock and its nuclear waste canisters in which betonite is sealed by an expansive soil, bentonite. The bentonite undergoes saturation change from partially saturated to fully saturated, and we consider the phases of water, water vapor due to temperature change, and gas in the voids of solid skeleton. Since the bentonite exhibits strong swelling behavior when it gets wet, we also look at its swelling stress in the modeling. For the near field rock mass, we analyze the long term change of stresses induced by the complex processes of excavation, long term high temperature by the canister, and the swelling of the bentonite. Furthermore, we assume that rock mass can creep, which is represented by a temperature dependent creep model, BGRa model. The governing equations of THM processes are established by taking capillary pressure, gas pressure and displacement as primary unknowns. To save computation expensive without loosing accuracy, we solve the coupled equations by a hybrid of monolithic and staggered schemes. At the end, we present the results of our modeling and demonstrate the changes of fluid pressure, temperature, and stress in the bentonite and the rock mass over a relatively long period
Modeling of Non‐Isothermal THM Coupled Processes In Multi‐Phase Porous Media
The present work focuses on the finite element simulation of thermal hydraulic and mechanical (THM) processes in porous media. As a representative case, we investigate such coupled processes in the FEBEX type nuclear repository, which is built deep underground fully in saturated rock and its nuclear waste canisters in which betonite is sealed by an expansive soil, bentonite. The bentonite undergoes saturation change from partially saturated to fully saturated, and we consider the phases of water, water vapor due to temperature change, and gas in the voids of solid skeleton. Since the bentonite exhibits strong swelling behavior when it gets wet, we also look at its swelling stress in the modeling. For the near field rock mass, we analyze the long term change of stresses induced by the complex processes of excavation, long term high temperature by the canister, and the swelling of the bentonite. Furthermore, we assume that rock mass can creep, which is represented by a temperature dependent creep model, BGRa model. The governing equations of THM processes are established by taking capillary pressure, gas pressure and displacement as primary unknowns. To save computation expensive without loosing accuracy, we solve the coupled equations by a hybrid of monolithic and staggered schemes. At the end, we present the results of our modeling and demonstrate the changes of fluid pressure, temperature, and stress in the bentonite and the rock mass over a relatively long period
Modeling of Non‐Isothermal THM Coupled Processes In Multi‐Phase Porous Media
Shao, Jian‐Fu (editor) / Burlion, Nicolas (editor) / Wang, Wenqing (author) / Shao, Hua (author) / Kolditz, Olaf (author)
2013-02-19
12 pages
Article/Chapter (Book)
Electronic Resource
English
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