Abstract
Hydraulic-thermal coupling is a key problem in rock mass engineering, especially in the disposal of nuclear wastes in deep rock mass. To accurately describe the coupling action of rock mass when under the interaction of hydraulic stress and thermal, the hydraulic-thermal coupling solving methods were proposed in this paper; in addition, the corresponding hydraulic-thermal coupling program FRHT3D was complied. Consequently, the numerical simulation was performed, it can be concluded that the flow speed is faster when the coupling effect is considered at the unstable seepage stage, and the seepage coupling solution is larger than that of uncoupling. Furthermore, when the coupling effects are considered, the permeable water head solution is much larger than that of the uncoupling solution at the unstable seepage stage. The proposed hydraulic-thermal coupling solving methods and programs can be applied to rock mass engineering practice.
Highlights
Hydraulic-thermal coupling is one of the most important subsystems of the thermal-hydraulic-mechanical (THM) system; it is a new research area with wide application
The model was employed for the purpose of describing the evolution of permeability and reactive transport behavior within rock fractures by Geofluids taking into account the geochemical processes of the freeface dissolution and the pressure dissolution
The flow speed is faster when the coupling effect is considered at the unstable seepage stage, and the seepage coupling solution is larger than that of uncoupling
Summary
Hydraulic-thermal coupling is one of the most important subsystems of the thermal-hydraulic-mechanical (THM) system; it is a new research area with wide application. Cacace and Jacquey [2] developed theory and numerical implementation describing groundwater flow and the transport of heat and solute mass in fully saturated rocks with elastoplastic mechanical feedbacks; in the model, fractures were considered being of lower dimension than the hosting deformable porous rock. Ogata et al [3] developed a multiphysics numerical model to predict the fluid flow and mass transport behavior of rock fractures under coupled thermal-hydraulic-mechanicalchemical conditions. The fluid mechanics and boundary layer theory of heat conductivity theory were applied to the study of water-rock heat transform, and the heat transform between single fissure interface and water fluid was analyzed, its hydraulic-thermal model was established, and the effect of hydraulic-thermal coupling was systematically studied
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