Abstract
The effect of increasing temperature on the hydro-mechanical properties of rocks is a highly important topic. When we select a site for underground excavation for the disposal of high-level radioactive waste and CO2-underground storage, it is necessary to know the effects of temperature and confining pressure with water, called the deep geological environment. In fact increasing temperatures cause micro-cracking and the production of new clay minerals under long-term immersion in hot water at 90C . It has to be pointed out that the long-term stability of rocks under deep geological environments can be damaged by chemical processes. The chemical weathering in hot water is a time-dependent phenomenon, and it is important to consider hydro-thermal-mechanical properties in rocks under deep geological environments. However, there are few studies of the time and temperature effects on mechanical properties. Additionally, there are only a few studies of sedimentary rocks compared with crystalline rocks.
