Influence of cap size and strength on settlements of TDM-piled embankments over soft ground

Journal article

Authors/Editors

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Publication Details

Author list: Phutthananon, Chana; Jongpradist, Pornkasem; Jamsawang, Pitthaya;

Publisher: Taylor and Francis Group

Publication year: 2020

Volume number: 38

Issue number: 6

Start page: 686

End page: 705

Number of pages: 20

ISSN: 1064-119X

eISSN: 1521-0618

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85066114587&doi=10.1080%2f1064119X.2019.1613700&partnerID=40&md5=ff7c9bea8aee82c074dc4fc7d2f84f0b

Languages: English-Great Britain (EN-GB)

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Abstract

This study investigates the impact of pile cap size, soft layer thickness and pile strength on load transfer and settlement behaviors of embankments supported by floating and fixed T-shaped deep cement mixing piles and conventional DCM piles under volume control. Preliminary investigation is performed by a series of small-scale physical model tests. The results reveal that the differential settlement can be substantially reduced with an enlarging pile cap as a result of larger embankment load transferred to the piles. The extended numerical analysis results demonstrate that the pile efficacy is related to the individual pile bearing capacity, which, in turn, depends on the pile cap size. The soft layer thickness has an insignificant effect on differential settlement but a significant effect on average settlement, while the pile strength plays an important role in differential settlement only when the cap size is not very large. Shape factor of at least 3.0 is recommended to ensure the reduction in differential settlement and minimize the effect of the change in pile strength. © 2019, © 2019 Informa UK Limited, trading as Taylor & Francis Group.

Keywords

cement pile, pile efficacy, settlement