Fracture hydraulic characterization based on aperture data measured by 50 cm scale rock sample

Sawada, Atsushi ; Tetsu, Keiichi*; Sakamoto, Kazuhiko*

The homogeneous one-dimensional parallel plate model is usually applied for nuclide migration model in a single fracture. An actual fracture in the natural geological environment has complex rough surface. It is one of issues for developing the methodology how to define the representative parameters used for the parallel plate model, such as transmissivity and aperture. In this study, we conducted the fracture geometrical characterization by grinding 50 cm scale of rock block including a single natural fracture, and we obtained fracture aperture distribution. The relationship between fracture aperture distribution and hydraulic characterization was examined by comparing numerical simulation with hydraulic test results.