There is no definite procedure in evaluating consolidation coefficients and working shearing strength of alluvial clay soils by the soil test in the laboratory. In this paper writers have suggested a method of estimating these values basing on their experience on consulting jobs for the construction of harbor projects in Japan.
In evaluation consolidation coefficients, problems of the secondary compression, side friction in consolidation box and effects of remolding on consolidation have been studied.
Dilatancy phenomena of clay soils have been studied in consolidated drained shear test by the direct shear box, relating to the neutral stress during shear.
And it has been found that the contraction of clay soils in the direct shear box is mainly the consolidation of soils resulted from the increase of principal stress and the rotation of principal axes. Although it had been clarified that relation between the consolidation stress corresponding to the preconsolidation load and principal stress during shear and also creep in shear are decisive factors in estimating the shear strength of soils, it has been concluded that q_u/2 method is still the best procedure and well expresses the shearing stress during shear in fields, because researches necessary for constituting new method are still merger.

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