Relationship between fault transmissivity, flow dimensions and effective hydraulic conductivity in siliceous mudstone of the Wakkanai Formation around the Horonobe Underground Research Laboratory in Japan

Ozaki, Yusuke  ; Ishii, Eiichi   

This study estimated the effective hydraulic conductivity around the Horonobe URL from the monitoring data of inflow into shaft and change in hydraulic pressure measured in HDB-6 for over ten years. The effective hydraulic conductivity was related to the fault transmissivities and flow dimension using Landau-Lifshitz-Matheron's formula. From the comparison of the estimated effective hydraulic conductivity with the calculated fault transmissivities, the effective hydraulic conductivity was compatible with the transmissivities considering the dependency on ductility index and flow dimension.