Al-Darraji, F, Sadique, MM, Yu, Z, Shubbar, A and Marolt Cebasek, T (2025) Performance of Confined Concrete-Filled Aluminum Tube Pile Groups under Combined Loading. Geotechnical and Geological Engineering, 43 (2). ISSN 0960-3182

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Abstract

Recent advancements in foundation engineering have introduced composite piles, specifically the Confined Concrete-Filled Aluminum Tube (CCFAT) pile system, which can effectively support both vertical and lateral loads. However, the behavior of composite piles under combined loading conditions remains largely unexplored. This research investigates the performance of CCFAT pile groups installed in loose sand and subjected to combined loads. Experimental studies focused on 1 × 2 and 2 × 2 CCFAT configurations with varying slenderness ratios (Lm/d) of 10, 15, and 20. These experiments were used to validate Finite Element (FE) models. Numerical simulations were then conducted for new configurations, including 2 × 3 and 3 × 3 CCFAT piles, to gather additional performance data. Results indicated that the ultimate vertical capacity of the CCFAT pile groups increased with the Lm/d ratio. Under combined loading, the ultimate lateral capacity also improved with higher vertical loads for a given Lm/d ratio. The laboratory findings showed a near-linear relationship between both ultimate vertical and lateral capacities and the Lm/d ratio. Failure mechanisms identified through numerical simulations revealed that CCFAT pile groups experienced punching shear failure, indicative of confined deep flow behavior. Under specific vertical loads, lateral loading resulted in soil compression on the right and tension on the left, causing heave and depression zones, significant soil yielding, and wedge formations. Sensitivity analyses highlighted that, for pure lateral loads, the internal friction angle and Young’s modulus significantly affect CCFAT pile group behavior, while under vertical loads at 80% of ultimate vertical load (Puv), the internal friction and dilatancy angles have a greater impact on lateral capacity than other parameters. Based on these findings, new expressions were proposed to calculate the ultimate lateral load (Pulv) for CCFAT pile groups under combined loading conditions, integrating the identified influencing factors.

Item Type:	Article
Uncontrolled Keywords:	0905 Civil Engineering; Geological & Geomatics Engineering
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering
Divisions:	Civil Engineering and Built Environment
Publisher:	Springer
SWORD Depositor:	A Symplectic
Date Deposited:	06 Jan 2025 11:55
Last Modified:	06 Jan 2025 12:00
DOI or ID number:	10.1007/s10706-024-03002-0
URI:	https://researchonline.ljmu.ac.uk/id/eprint/25168

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