On the THM behaviour of argillaceous rocks

The analysis and interpretation of the thermo-hydro-mechanical (THM) behavior of argillaceous rocks remain significant challenges in the field of Geotechnical Engineering. This paper delves into the THM behavior of these geomaterials, considering their diverse compositions and geological backgrounds. It thoroughly examines key factors and features related to their hydromechanical behavior, including compressive loading, brittleness, anisotropy, permeability, and hydromechanical coupling. The paper underscores the crucial role of anisotropy while acknowledging the complexities of permeability determination in these materials. Furthermore, the paper explores their thermal behavior, encompassing aspects such as elastic response, volume change behavior, strength, thermal pressurization, and the impact of temperature on permeability. It also sheds light on the distinct mechanical responses exhibited by various types of argillaceous rocks when subjected to heating. Additionally, the study delves into the phenomenon of thermal pressurization and the concurrent increase in hydraulic conductivity with rising temperature. Moreover, it highlights the remarkable selfsealing properties inherent to these materials, which remain unaffected by temperature variations and their susceptibility to long-term deformation under thermal influences. This review offers valuable insights into the coupled THM behavior of argillaceous rocks, underlining the pressing need for further research in this specialized field.