Mechanical state analysis of different variants of piled rafts

Abstract

Traditional raft design methods describe unpiled and fully piled rafts. The current paper aims to discuss intermediate raft design variants when the raft is at the same time partially supported by piles and partially rests on the ground. The loading conditions of all variants as well as mechanical properties assumed to be identical, general numerical simulation assumptions are also the same. The task is to analyse the stress and strain state of the raft for all variants (unpiled raft, partially piled raft, fully piled raft), to compare the results and to determine the most rational case. Raft settlements, bending moments and expenses of the materials are compared on the basis of the results.

Design Sequence on The Base on Numerical Simulation and Experimental Testing of a Plane Frame Under Deformations of Piled Foundations

“…There are two important aspects for significant influence of bending moment of column (Samofalov et al 2010(Samofalov et al , 2015Mandolini et al 2013;Popov 2015):…”

Influence of the Pile Stiffness on the Ground Slab Behaviour

“…Such a task of the floor plate design consists of several components: the pile stiffness calculation, pile layout, selection of the floor plate thickness, reinforcement type and eligibility of calculations of floor plate settlements (Samofalov et al 2015;Basile 2015;Poulos 2001). According to the results of the numerical analysis, the existence of the raft does not affect the vertical stiffness of the pile head, if loadings less than the allowable load.…”

“…In such a task, the accuracy of calculations depends on the accuracy of soil characteristics and the evaluation of the interaction of the piles and pile installation technologies. The work of pile ground and pile behaviour can be modelled by FEM and BEM (Comodromos et al 2009;Concrete Society 2003;Gusev, Tashkinov 2012;Mendonça, Paiva 2003), side friction and basis modelling support with springs (Ripunjoy 2014;Fioravante 2002;Samofalov et al 2015) instead of the pile plate in the model to put an elastically ductile or elastic spring support (Ripunjoy 2014;Fioravante 2002;Samofalov et al 2015). Some of the methods are useful only for preliminary design or for checking purposes, while others are capable of giving detailed performance predictions and can be used for detailed design (Technical Committee TC18 on Piled Foundations 2001).…”