Large deformation analysis of intermittent pile penetration into dense sand incorporating a state dependent Mohr–Coulomb model
File(s)Ye et al cgj-2023-0090.pdf (15.15 MB)
Accepted version
Author(s)
Type
Journal Article
Abstract
The challenges of predicting the stresses acting around piles driven in sand limits meaningful analysis of their single and group loading responses, aging processes and scale/in-situ stress level dependency. Benchmark local stresses measurements made in the sand mass and pile shaft in Calibration Chamber (CC) models show that sharply different regimes act when the pile is either penetrating or temporarily stationary. This paper presents an Arbitrary Lagrangian–Eulerian (ALE) finite element simulation of installation into dense sand, highlighting the stress changes developed between intermittent penetration stages and exploring the effects of initial stress level. The installation by cyclic jacking of closed-ended model piles studied in a highly-instrumented CC experiments is simulated with a state-dependent Mohr–Coulomb model calibrated to high-quality element tests on the sand employed. The predicted pile head loads and local stresses are compared with the CC experiments, showing generally good agreement over the lower parts of the pile shaft while also matching key field-scale trends from CPT-based practical design approaches. More advanced constitutive modeling appears necessary to eliminate discrepancies noted over the higher shaft levels, which may be linked to currently neglected aspects of the sands’ highly non-linear behavior, including grain crushing and hysteresis under cyclic loading.
Date Issued
2024-12-12
Date Acceptance
2024-09-08
Citation
Canadian Geotechnical Journal, 2024, 62 (2025)
ISSN
0008-3674
Publisher
Canadian Science Publishing
Journal / Book Title
Canadian Geotechnical Journal
Volume
62
Issue
2025
Copyright Statement
Copyright © The Author(s) or their Institution(s). This is the author’s accepted manuscript made available under a CC-BY licence in accordance with Imperial’s Research Publications Open Access policy (www.imperial.ac.uk/oa-policy)
License URL
Identifier
http://dx.doi.org/10.1139/cgj-2023-0090
Publication Status
Published
Date Publish Online
2024-09-21