UNDRAINED SHEAR STRENGTH BEHAVIOR OF OCEAN SILT UNDER LOW STRESS CONDITIONS AND ITS APPLICATION TO ANALYZING SUBMARINE SHALLOW LANDSLIDES
WANG Hu1，2，LIU Hongjun1，2，ZHANG Minsheng1，2
(1. Key Laboratory of Marine Environment and Ecology，Ministry of Education，Ocean University of China，Qingdao，
Shandong 266100，China；2. College of Environmental Science and Engineering，Ocean University of China，Qingdao，
Shandong 266100，China)
Abstract：A series of the vane shear tests and the triaxial tests investigating the undrained shear strength of typical ocean silt under low stress conditions were carried out to understand the submarine geological hazards such as shallow landslide. It was found that the degree of consolidation affected the vane shear strength of silt and the vane shear strength decreased as the excess pore pressure increased. The triaxial undrained shear strength of silt is affected by the over consolidation ratio and the confining stress level but not by the shear strain rate. All samples reached the critical state in the triaxial tests and the shear strength at the critical state increased with the increase of the over consolidation ratio and the confining pressure. The vane shear strength and the triaxial undrained shear strength at critical state were normalized using the mean effective stress and the good consistency was found between them. The critical strength line of marine silt under low stress condition was obtained，which explained the reactivation of the submarine landslide by the storm wave in the Yellow River delta.
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2014, Vol. 33 
