SUMMARYThree-dimensional finite element analysis was carried out to investigate the behaviour of single piles subjected to lateral soil movements and to determine the ultimate soil pressures acting along the pile shaft. The finite element analysis program ABAQUS was used for the analysis and run on a SUN Workstation. The von Mises constitutive model was employed to model the non-linear stress-strain soil behaviour. The pile was assumed to have linear elastic behaviour. This was considered to be a reasonable approximation, as the maximum stress developed in the pile did not exceed the yield stress of the concrete pile. The length of the pile is 15 m; the width of the square pile is 1 m: The three-dimensional finite element mesh used in the analysis was optimized taking into account the computing capacity limitations of the Sun Workstation. The computed ultimate soil pressures agreed well with those from the literature. The shapes of the soil pressure versus soil movement curves and the soil pressure versus the relative soil-pile displacement curves as well as the magnitude of the relative soil-pile displacement to mobilize the ultimate soil pressures were in reasonable agreement with those reported by other researchers.
This Paper describes a new iterative procedure for the analysis of the downdrag forces in end-bearing pile groups. Special emphasis is placed on the rate of increase of downdrag forces with free field soil settlement. Pile–soil–pile interaction is modelled using Mindlin's elastic solution for a point load in an elastic half-space. Pile–soil slip is taken into account by limiting the shaft friction at the interface. Parametric studies were conducted to elucidate the parameters that govern the relationship between free field soil settlement and downdrag forces induced in a pile group. Results indicated that interior piles of a large pile group experience relatively small downdrag forces, especially when the pile spacing is small. The validity of the proposed method is demonstrated by back-analysing two model studies of negative skin friction on pile groups. The proposed method is also validated against the field test results of a 38 pile group. The computed results show an encouraging degree of agreement with the experimental data. L'article décrit une nouvelle méthode itérative permettant d'analyser les forces d'enforcement induit s'exerçant sur un groupe de pieux travaillant en pointe. On s'intéresse plus particuliérement à la vitesse d'accroissement de ces forces lors du tassement libre du sol. L'interaction pieu–sol–pieu est modélisée à l'aide de la solution élastique de Mindlin pour un chargement ponctuel dans un demi espace élastique. Des études paramétriques ont été réalisées pour déterminer les paramétres qui régissent la relation existant entre le tassement libre du sol et les forces d'enfoncement créées sur un groupe de pieux. Il apparaît que les pieux internes d'un groupe de pieux de grande dimension subissent des forces d'enfoncement relativement faibles, surtout lorsque les pieux sont rapprochés. La méthode proposée a été validée par une analyse en méthode inverse de deux modéles en frottement négatif, ainsi que par des essais réalisés in-situ sur un groupe de 38 pieux. Les valeurs obtenues par les calculs sont encourageantes car assez proches des données expérimentales.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.