Coefficiency of permeability of clay has a tendency to take an important role in the consolidation analysis of clay. The permeability properties of clay, however, seems to remain a relatively minor investigated field. One of a few findings in this field of study is the existence of a linearity between the logarithm of coefficient of permeability and void ratio. Therefore, for the purpose of further investigation of the permeability properties of clay, a relationship between coefficient of permeability and grain size distribution curve was focused as one of the study themes. This paper first presents the new concept developed by authors for clarifying soils based on a grain size distribution curve. It is defined as the classification radius method. Applying this method, with a sand sample used in this paper shows that good relationship between permeability coefficient of sand and grain size distribution curve is detected. Furthermore, it will be shown that the soil classification method, when used on the study of permeability properties of clay, can derive coefficient of permeability of clay closed to the value obtained by a consolidation test. Finally, this paper will show the figure which represents a relationship of depth and coefficient of permeability including sand stratum and clay. The figure gives us a lot of information on the permeability properties of ground.


Recently, the coefficient of permeability of a marine clay has come to take an important role in a nonlinear consolidation analysis (Imai,1988, Yoshikuni, et al. 1990). However, comparing to the volume of findings on a permeability properties of sand and gravel strictly concerning with grain size distribution curves(Uno, et al. 1993), in general, a physical meaning of the permeability of clay hasn't been summarized yet(Takane et al. 1985, Imai etal. 1989).

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