Finite Element Modelling Techniques for the Assessment of Stress Distributions of Laterally Loaded Piles

E. S.Y. Ma

In the proceedings of: GeoVancouver 2016: 69th Canadian Geotechnical Conference

Session: FOUNDATION DESIGN - VI Soil-Structure Interaction

ABSTRACT: A rail electrification scheme required deep foundations including 1m diameter drilled shafts and rectangular groups of four 0.323m diameter micropiles to resist lateral loads. A key consideration for the design was the impact of lateral loading on adjacent structures. A finite element study has been undertaken to investigate the complex soil-structure interaction for the assessment of lateral stress distributions using three dimensional (3D) . Typical ground conditions consist of alluvium overlying the Mercia Mudstone, and were modelled with the linear elastic Mohr-Coulomb model under undrained conditions. As 3D modelling may be impractical for a designer, techniques were developed in order to use a simpler approach using plane strain numerical analyses with . Several modelling limitations with the embedded pile row elements were identified which required specific modelling techniques to obtain more realistic responses. This paper aims to demonstrate that the plane strain method, with suitable modifications, offers a reasonable alternative to the 3D modelling for the determination horizontal stress distributions adjacent to laterally loaded piles.

RÉSUMÉ: Les fondations profondes, composés de pieux caissons de 1,0 mètre de diamètre et de pieux micros de 0,323 mètre de strua été menée pour -structure et la distribution des contraintes latérales du terrain. La condition géologique typique du -plastique et non-drainé, en utilisant le critère de rupture de Mohr-teurs. Alors, quelques techniques de modélisation ont été évaluées afin que les « Embedded Pile Row » ont été identifiées et la modélcomparables aux résultats du modèle 3D. Ce document vise à montrer que la modélisation en 2D avec des modifications appropriées peut donner des résultats comparables à la modélisation 3D pour des contraintes latérales.

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