In order to investigate an effect of stress history on K_0 value and a change in undrained shear strength which caused by secondary consolidation during K_0 condition, triaxial compression tests usign undisturbed marine clay were carried out. Results from laboratory CK_0 undrained shear test could be summarized as follows. 1) K_0 value would be subject to stress history. 2) K_0 value would be kept constant during secondary consolidation. 3) The peak strength of undrained shear test in secondary consolidated state would be increasing in proportion to consolidated elapsed time on scale of logarithm. 4) The increase of undrained shear stregnth could be explained from the decrease of void ratio during secondary consolidation.
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