[2C05-09] Material 2

[2C07] Consideration based on Thermodynamic Theory on Effect of Temperature on Swelling Stress of Buffer Material in Geological Disposal

*Haruo Sato¹ (1. Okayama University)

Keywords:Geological disposal, Buffer material, Bentonite, Swelling stress, Temperature dependency, Thermodynamics

Buffer material composing engineered barrier in the geological disposal of a high-level radioactive waste is affected by temperature from the waste. Swelling stress distribution by water content distribution develops in addition to the effect of temperature distribution in the buffer material by penetration of groundwater from the surrounding rock mass. In this study, we particularly discussed the effect of temperature on the swelling stress of the buffer material from the viewpoint of thermodynamics.