Numerical Simulation Of Behavior Of Cone Penetromter Penetrating In Double Layered Clay In Centrifuge Testing

Cone penetration tests have been widely used in in-situ tests to obtain shear strength of soil.It has the advantages of being efficient and convenient,no sampling,collecting the maximum data,lowing interference and lowing cost,especially suitably for applying in geotechnical engineerings such as highway and railway projects with linear distribution and wide scope.Currently,CPT technique has been widely used in marine geotechnical engineering on-site and centrifuge experiments to determine the soil strength of soft soil.Aiming at the use of CPT in centrifuge tests,the CPT penetrometer is usually used to penetrate in centrifuge to obtain continued shear strength of the target soil samples before studying the behavior of soft soil.However,in the centrifuge tests,due to the influence of the centrifugal acceleration,the CPT in the centrifuge will have different penetration characteristics for cone in two-layered clay.Based on the previous studies,RITSS code was carried out to simulate the process of cone penetration in double layered clay,and address the cone penetration behavior:(1)Conduct the numerical simulation by using the RITSS code to model the cone penetrometer penetrating in to the two-layer stiff-soft and soft-stiff marine clay deposits,respectively.The numerical model is validated against model test results,with good agreement obtained.(2)Conduct parametric study to study the influence of the various parameters to provide insight into the soil flow mechanisms and cone penetration resistance profiles,respectively,in which the influence of cone bearing capacity factor profiles were addressed,including the g-level,the strength ratio between the upper soil and the lower soil and the normalized thickNess of the upper soil.(3)To quantify the influence of each factor,a formula of correcting the resistance was proposed to provide more arcuate results for the soil profile interpolation.