不連続性岩盤内の透水性の不均一性と流れの局所化について

抄録

This paper describes a relationship between heterogeneous permeability profile and the geometry of localized flow paths based on a laboratory experiment. A 30cm cube of chert containing multiple sets of natural fractures is used for the study. Each of the six faces of the block is divided into 25 hydraulically isolated subpanels, i.e. 150 subpanels in total, which are connected to a separate flow line for control or monitoring. The pressure and flow responses under different boundary conditions are inverted to provide information on the spatial variation of hydraulic conductivity. It has been shown that, because of the wide variation in permeability, the limited number of high permeability zones are creating localized flow paths which controll the overall flow characteristics in a fractured chert block.