A Study on material properties of diatomacious madstone with changing water content

Maekawa, Keisuke  ; Osada, Masahiko*

It has been known that the rock material properties would be different from the condition before excavation due to air-ventilation into the shaft. The phenomena would be significant to assess a long-term geological disposal safety. But any methodologies to understand the effect have not been established yet. This paper shows the results of rock tests for engineering properties including drying-induced deformation experiment as one part of establishing research and assessment methodologies of the sedimentary rock material properties. As a result we show the tendency of drying-induced deformation of diatomaceous mudstone and the significant points of rock tests for engineering properties.