Effect of Induced Lateral Displacement on Vertically Loaded Large Piled-Raft Response in Sandy Soil

DOI

10.2991/978-94-6463-478-5_9How to use a DOI?

Keywords

Large piled-raft; Settlement; Load-sharing behavior; Bending moment

Abstract

The lateral displacement can also be induced in the piled-raft foundations (PRFs) for onshore structures in addition to vertical load on account of the excavations carried out very close to the existing PRFs. In the present study, three-dimensional numerical analyses are performed on vertically loaded large PRFs in dense sand incorporating induced lateral displacement to analyse the settlement and load-sharing behaviour, bending moment behaviour of raft and piles in PRF. Parametric study is carried out considering both uniform (UPL) and non-uniform pile length (NUPL) configurations in which pile spacing, pile number, and raft-soil stiffness ratio are varied. Results show that for all considered pile spacings, due to induced lateral displacement average settlement increases, whereas differential settlement decreases for both configurations. The NUPL configuration shows lesser differential settlement than UPL configuration. The proportion of vertical and lateral load carried by piles in NUPL configuration is lesser and more, respectively, compared to that of UPL configuration. The NUPL configuration yielded a greater percentage reduction of average settlement due to increase in pile number. With the variation in raft stiffness from flexible to rigid, negative differential settlement is observed for NUPL configuration. The lateral load carried by piles in NUPL configuration is higher than that of UPL configuration for flexible rafts. The bending moment in raft is observed to be significantly lower in the case of NUPL configuration than UPL configuration. The piles in NUPL configuration show lesser bending moment at the pile head than that of UPL configuration for a rigid raft.

Copyright

© 2024 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Banchiva K. Marak
AU  - Baleshwar Singh
PY  - 2024
DA  - 2024/07/23
TI  - Effect of Induced Lateral Displacement on Vertically Loaded Large Piled-Raft Response in Sandy Soil
BT  - Proceedings of the 7th International Conference on Civil Engineering for Sustainable Development (ICCESD 2024)
PB  - Atlantis Press
SP  - 108
EP  - 124
SN  - 2589-4943
UR  - https://doi.org/10.2991/978-94-6463-478-5_9
DO  - 10.2991/978-94-6463-478-5_9
ID  - Marak2024
ER  -