Influence of the pile toe condition on the dynamic response of a group of pile foundations

Abstract

The anchorage of the piles on a stiffer soil layer plays an important role to transmit the loads of the superstructure to the soil. Depending on the pile toe condition, three configurations of piles are considered: floating piles, rested, and anchored piles. To study the effect of the pile toe condition on the dynamic response of pile and pile groups, a three-dimensional finite element modeling of the soil-pile-slab dynamic interaction is presented. The soil and piles are represented as continuum solids and the slab by structural elements. Quiet boundaries are placed at the boundaries of the model to avoid wave reflection. The formulation is based on the substructuring method. The dynamic response is obtained in terms of the dynamic impedances. In this study the dynamic response of the floating, rested, and anchored piles are analyzed and the group effect is shown. An analysis of the horizontal and vertical pile foundation impedances is presented and the results are compared with different configurations.

Vertical and horizontal dynamic response of suction caisson foundations

“…The idea is to analyze the soil-structure interaction problem in a succession of steps. Each step considered will permit to solve in an easier way than the global problem (Kaynia et al1982;Kausel et al 1978;Viniprova et al 2003;Messioud et al 2016Messioud et al ,2019Pecker et al1984).The substructures considered are composed of soil,on the one hand, and of the structure,on the other hand, as shown in Figure1a. The soil and structure have been separated and the balance is suitable by the application of inertial forces P b , P f (Figure1a), The model is subject to an arbitrary excitation along the boundary (Figure 2a).…”

“…Moreover, the consistent infinitesimal finite element cell method (CIFECM) (Emani et al2009) was used for calculating the dynamic impedances of a group of piles. In this context, Messioud et al(2011Messioud et al( ,2016Messioud et al( , 2019 used FEM with absorbing boundaries to determine the vertical and horizontal dynamic impedances of a group of floating and rested piles on a rigid substratum. Using the boundary element method with FEM (BEM-FEM), the vertical and coupled sliding-rocking vibrations of suction caissons were studied by Liingaard et al (2007).…”