The change in micro pore size distribution due to one-dimensional consolidation was studied using a mercury intrusion porosimeter. Amagasaki clay, Osaka Bay clay and Kyoto clay, all of which belong to the Osaka Group, were used as the samples. The pore size distribution of the Amagasaki clay and Kyoto clay was sensitive to the increment of consolidation pressure and changed accordingly; however, in the case of the Osaka Bay clay, the change was not so obvious. The reason for this disparity is that these clays differ not only in physical properties but also in cementation materials. The relationship between pore size distribution and hydraulic conductivity was investigated using the Capillary model, the Hydraulic-radius model and the Marshall probabilistic model, proposed by Garcia Bengochea. None of the models provided a general relationship, but by using the factors d_p and n (d_p is middle pore size and n is porosity), a good correlation between the factors (d_p~2n) and hydraulic conductivity was obtained.
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