Abstract
A series of large-scale laboratory permeability tests have been conducted to clarify the effects of grain size distribution on saturated coefficient of permeability of rockfill dam material. The experimental results show that (1) the saturated coefficient of permeability Ksat of rockfill materials is larger than 1.0×100cm/s for those with D10 in the order of several millimeters; (2) the saturated coefficient of permeability Ksat of the materials is influenced by hydraulic gradient, i for the materials with i between 0.01 and 0.2 and Ksat larger than 1.0×10-1cm/s; (3) the saturated coefficient of permeability of coarse granular material is affected by not only the value of D10 but also D60
