ON THE NUMERICAL SIMULATION of A TUBE-INSTALLED DISPLACEMENT PILE
Considering effects of pile installation is a challenging task for numerical simulations of displacement piles. Full and partial displacement piles include driven, tubeinstalled, screw and continuous flight auger piles. This paper presents 2-D axysimmetric finite element analysis of a tube-installed displacement pile. For initialising the effects of installation, stress-controlled cavity expansion (K-pressure) is considered. An advanced soil constitutive models, which consider soil stiffness depending on the stress level and strain level, has been applied. It is shown that realistic stress fields can be obtained by stress controlled cylindrical cavity expansion up to the appropriate value of K. The method is considered as a feasible method for engineering practice to simulate the effects of installation using standard small strain finite element analyses. The applicability of this method is not limited to displacement piles but can be also extended to column type foundations in general.