Non-linear finite-element analysis of axially loaded piles driven in chalk

Kai Wen*, Stavroula Kontoe, Richard J. Jardine, Tingfa Liu, Lin Pan

*Corresponding author for this work

Research output: Contribution to conferenceConference Paperpeer-review

Abstract

Driven piles are often employed to support onshore and offshore structures at low density, porous weak carbonate chalk sites, which are encountered across Northern Europe and under the North and Baltic seas. Their efficient design is limited by uncertainties regarding their ultimate axial capacity and load-displacement behaviour. Intensive axial testing has been undertaken recently for the ALPACA Joint Industry Project on piles driven at a UK chalk site, in conjunction with comprehensive chalk characterisation studies. This paper presents PLAXIS-2D numerical simulations of such piles' axial loading behaviour. The simulation accounts for three distinct zones of chalk identified around the pile shafts after installation. These comprise a thin annular zone of destructured, puttified, chalk and a second, thicker, annular zone of highly fractured chalk; both have different mechanical properties compared to the surrounding parent intact chalk mass. The FE analyses investigate how shaft resistance, axial capacity and load-displacement behaviour develop differently in compression and tension tests.
Original languageEnglish
DOIs
Publication statusPublished - 26 Jun 2023
Event10th European Conference on Numerical Methods in Geotechnical Engineering - Imperial College London, London, United Kingdom
Duration: 26 Jun 202328 Jun 2023

Conference

Conference10th European Conference on Numerical Methods in Geotechnical Engineering
Abbreviated titleNUMGE 2023
Country/TerritoryUnited Kingdom
CityLondon
Period26/06/2328/06/23

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