Unconfined compression test and constant water content test under low confining pressure, in which suction and volume change in specimen were measured, were carried out for dynamically compacted specimens of a silty clay. Effects of degree of saturation and suction on unconfined compressive strength and undrained shear strength under low confining pressure were examined using the suction stress. It was found that the confining pressure, in which "suction stress" is considered, have influence on theunconfined compressive strength and the undrained shear strength under low confining pressure. This result shows the applicability of the shear strength equation proposed by Fredlund et al. (Fredlund, D.G., Morgenstern, N.R. & Widger, R.A. 1978. The shear strength of unsaturated. Canadian Geotechnical Journal 15: 313-321) to the constant water content condition.
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