Pile driving installation effects in low-to-medium density chalk
File(s)
Accepted version
Author(s)
Vinck, Ken
Liu, Tingfa
Jardine, Richard
Buckley, Roisin
Lawrence, James
Type
Journal Article
Abstract
This paper explores the effects of pile driving installation on low-to-medium density chalk. The damage developed around eight open and closed, steel and concrete, piles driven at the St Nicholas at Wade test site in Kent, UK, was investigated by carefully logging and micro-sampling chalk from around their shafts after long ageing in situ. The observations identified relatively thin annuli of destructured 'putty' chalk left around the pile shafts. Related numerical studies have confirmed that, after reconsolidation in situ, the Zone A material largely controls
the piles’ axial load-displacement behaviour. Measurements of the reduced Zone A water content profiles around piles with different geometries, scales and materials confirm that their thicknesses scale primarily with pile wall thickness tw. A second, more extensive, annular Zone B was also identified, which manifests far more frequent fracturing than the natural chalk. Earlier numerical analyses have shown that its degraded properties largely control the piles’ lateral loading responses. The Zone B annular thicknesses, and degrees of damage within them,
depend on both pile diameter D and tw. These observations are crucial to both modelling piles driven in chalk and any lateral loading design calculations.
the piles’ axial load-displacement behaviour. Measurements of the reduced Zone A water content profiles around piles with different geometries, scales and materials confirm that their thicknesses scale primarily with pile wall thickness tw. A second, more extensive, annular Zone B was also identified, which manifests far more frequent fracturing than the natural chalk. Earlier numerical analyses have shown that its degraded properties largely control the piles’ lateral loading responses. The Zone B annular thicknesses, and degrees of damage within them,
depend on both pile diameter D and tw. These observations are crucial to both modelling piles driven in chalk and any lateral loading design calculations.
Date Acceptance
2026-07-28
Citation
Geotechnique Letters
ISSN
2045-2543
Publisher
ICE Publishing
Journal / Book Title
Geotechnique Letters
Copyright Statement
Subject to copyright.This paper is embargoed until publication. Once published the author’s accepted manuscript will be made available under a CC-BY License in accordance with Imperial’s Research Publications Open Access policy (www.imperial.ac.uk/oa-policy).
License URL
Publication Status
Accepted