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http://dx.doi.org/10.7843/kgs.2022.38.9.45

Numerical Formulation of Thermo-Hydro-Mechanical Interface Element  

Shin, Hosung (Dept. of Civil & Environmental Engrg., Univ. of Ulsan)
Yoon, Seok (Disposal Safety Evaluation Research Division, KAERI)
Publication Information
Journal of the Korean Geotechnical Society / v.38, no.9, 2022 , pp. 45-52 More about this Journal
Abstract
Because discontinuity in the rock mass and contact of soil-structure interaction exhibits coupled thermal-hydromechanical (THM) behavior, it is necessary to develop an interface element based on the full governing equations. In this study, we derive force equilibrium, fluid continuity, and energy equilibrium equations for the interface element. Additionally, we present a stiffness matrix of the elastoplastic mechanical model for the interface element. The developed interface element uses six nodes for displacement and four nodes for water pressure and temperature in a two-dimensional analysis. The fully coupled THM analysis for fluid injection into a fault can model the complicated evolution of injection pressure due to decreasing effective stress in the fault and thermal contraction of the surrounding rock mass. However, the result of hydromechanical analysis ignoring thermal phenomena overestimates hydromechanical variables.
Keywords
FEM; Fluid injection; Interface element; THM phenomena;
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Times Cited By KSCI : 1  (Citation Analysis)
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