Numerical Simulation of the Deep Penetration Process of Spudcans into Sand Overlying Clay Using the Extended Hypoplastic Models

摘要

In this paper the installation process of spudcan foundations into sandoverlying clay is simulated using the Coupled Eulerian-Lagrangianmethod (CEL). Extended hypoplastic models are used to simulate thesoils: the sand is simulated using the hypoplastic model, whereas theunderlying clay is simulated using the visco-hypoplastic model. Thehypoplastic model is well suitable to describe the nonlinear and inelasticbehavior of granular soils. Typical sand characteristics like dilatancy,contractancy and different stiffnesses for loading and unloadingcan be modeled. The visco-hypoplastic model describes the mechanicalbehavior of the cohesive soils allowing for viscous effects, i.e.creep, relaxation and rate-dependence. The numerical model is validatedagainst the experimental results of a centrifuge model test. Thebearing capacity curve as well as the velocity field from the numericalsimulation is compared with the centrifuge model test results. Thefailure mechanisms of the spudcans on dense sand overlying clay arerevealed by illustration of the development of the shear band. With useof the validated numerical models, the influences of the consistencystated of sand on the bearing capacity as well as the failure mechanismsare investigated.