Abstract
It is difficult to get an undisturbed sample from a slip layer of landslide. It is convenient if shearing characteristics of an undisturbed sample can be estimated from ones of a disturbed sample. Undrained triaxial compression tests were carried out to compare shearing characteristics of both specimens for six kinds of clay. Stress strain and pore water pressure relationships of undisturbed specimen and disturbed specimen were remarkably different. The strength parameters, c' and φ', in terms of effective stress are much the same. The cohesion in terms of effective stress is nearly zero for all clays. Therefore, we can obtain the strength parameters of undisturbed clay at sliding layer from the shear test for the remoulded reconsolidated clay.
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