Long-term Setup Of A Displacement Pile In Clay: An Analytical Framework

Abstract

This paper integrates the effects of pile installation, reconsolidation, pile loading and soil ageing into an analytical framework to predict the long-term setup of a displacement pile in clay. The increase of mean effective stress and the decrease of void ratio of surrounding clay during reconsolidation and soil ageing are determined to quantify the changes in undrained shear strength and shear modulus, which are the two key soil parameters controlling load carrying behaviours of piles. The bearing capacity factors and load-transfer curves are developed by incorporating the developed soil parameters. The analytical framework is then proposed and validated by predicting a well-documented pile field test. Good agreements between the analytical results and the measured data demonstrate that the pile setup can be reasonably predicted by the proposed framework. Comprehensive parametric studies are conducted to investigate the influences of overconsolidation ratio, secondary compression index and pile loading on the pile setup. The results indicate that a displacement pile in clay with a smaller overconsolidation ratio or a larger secondary compression index, or subjected to a larger load, exhibits a larger long-term bearing capacity.

Department(s)

Geosciences and Geological and Petroleum Engineering

Comments

National Natural Science Foundation of China, Grant 41772290

Keywords and Phrases

Displacement pile; Overconsolidation ratio; Reconsolidation; Secondary compression index; Setup; Soil ageing

International Standard Serial Number (ISSN)

0029-8018

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2023 Elsevier, All rights reserved.

Publication Date

15 Dec 2020

Link to Full Text

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