In-situ moisture monitoring methods for the sedimentary rocks as affected by groundwater salinity

Komatsu, Mitsuru*; Kishi, Atsuyasu; Tsukuda, Akie*

In this study, with the goal of applicability an in-situ measurement technique for monitoring generation and extension of the unsaturated zone around a drift, a set of water content measurement was carried out for the core samples collected during the excavation of pilot survey drift in a sedimentary rock formation. For the drill core collected under brine environment the Horonobe deep underground laboratory, FDR-V method was applied. FDR-V measures complex permittivity from reflection characteristic in the coaxial cable tip using an electromagnetic wave with high frequency. The results showed that the effects of the salinity on the measurement were insignificant.