STRENGTH BEHAVIOUR OF SOFT CLAY IN JIAXING OFFSHORE AREA BASED ON BALL PENETRATION TEST
In addressing the challenge of assessing the strength of soft clay in the foundation design of offshore wind turbines,this paper focuses on the strength calibration of soft clay in Zhejiang Jiaxing's offshore region by ball penetration tests and laboratory test results.The ball penetration factor Nball for moddy silty clay was obtained.The ball penetration factor Nball,DS,determined through consolidated quick shear tests,is ranged from 6.70 to 14.91,with a mean of 10.58 and a standard value of 10.91.Likewise,the factor Nball,UU,determined by using triaxial unconsolidated undrained shear test results,is ranged from 7.75 to 23.75,with a mean of 17.44,and a standard value of 19.03.The calibrated ball factor Nball provides a more accurate representation of the soft clay strength in Zhejiang Jiaxing's offshore area.We recommend adopting Nball,UU with a standard value of 19.03,calibrated from the triaxial UU test,as the parameter for interpreting the lower limit of strength.Additionally,Nball,DS with a standard value of 10.91,calibrated from the consolidated quick shear test,serves as the parameter for interpreting the best estimate(median value)of strength.
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