Configuration of hydraulic effective porosity based on borehole investigation in fractured rock

Sawada, Atsushi ; Takeuchi, Shinji; Saegusa, Hiromitsu; Amano, Kenji  

The groundwater flow velocity in void space of rock mass is one of the important parameters for evaluating mass transport in deep underground, especially on the safety assessment of high-level radioactive waste disposal. In general, the groundwater velocity in void space of rock mass is calculated by darcy velocity devided by the effective porosity. For estimating the effective porosity, the groundwater flowing void space should be evaluated. This paper describes configuration of the hydraulic effective porosity of fractured rock, and the study of estimating the hydraulic effective porosity by using borehole investigation data drilled from the surface.