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Application of Seabed Cone Penetration Test in Research on the Seafloor Geotechnical Engineering Characteristics in the Yellow River Estuary

CHU Li-peng;SUN Yong-fu;SONG Yu-peng;DONG Li-feng;ZHOU Qi-kun;MA Bin-bin;ZHANG Wei-peng;The First Institute of Oceanography,SOA;East China Normal University,State Key Laboratory of Estuarine and Coastal Research;Lanzhou University,School of Civil Engineering and Mechanics;  
The equipment for seabed cone penetration test(CPT)has a high working efficiency and can detect the strata continuously and vertically with a better data resolution.By analyzing 3CPT boreholes and1 geological borehole taken in the Yellow River Estuary,the strata of 20 meters below the seabed are divided into 5layers.From top to bottom,they are silt,silty clay,silt interbedded with silty sand or silty sand,silty clay and silt,respectively.The CPT curves can give better reflections of special geological phenomena such as the hard crust layers in the silt and the shell interlayers in the silty clay.A regression equation suitable for the study area is obtained through the correlation analysis carried out between the CPT parameters and the physical-mechanical parameters of the silty clay.For evaluating the liquefaction potential of the surface silt in the study area,the methods for liquefaction evaluation based on CPT data are adopted,of which the Seed method and the Olsen method are considered to be accurate in predicting liquefaction resistance of sandy soils.By comparing the cyclic stress ratio(CSR)calculated by the Seed method with the cyclic resistance ratio(CRR)worked out by the Olsen method,it can be concluded that the surface silt in the study area won't be liquefied if the seismic fortification intensity is designed as 7degree.If the seismic fortification intensity reaches 8degree,however,the silt layer will be liquefied,with the calculated maximum liquefaction depth being 3.7meters.
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