THE INFLUENCE OF PILE NUMBER ON THE PERFORMANCE OF PILED RAFT FOUNDATIONS IN SAND
Volume Title: ICASGE2025
Paper ID : 1104-ICASGE-FULL
Authors
1Faculty of Civil Engineering, HoChiMinh City University of Technology, Vietnam
2Can Tho University
Abstract
This study examines the behavior of piled raft foundations in sandy soils under vertical loading, focusing on load distribution and settlement. Physical model tests, analytical calculations, and numerical simulations were conducted to assess the effect of pile number on foundation performance. The results show that increasing the number of piles improves load distribution and reduces settlement. Specifically, when the number of piles increases from 1 to 4, settlement decreases by 25%, and with 9 piles, settlement decreases by 56%. Additionally, when increasing the pile number from 4 to 9, the load carried by the piles increases by 20% according to the PDR method, 10% in Plaxis, and 20% in experimental tests. The load-settlement curves show a linear response at low loads, transitioning to a non-linear behavior as the piles reach their ultimate capacity. The results from analytical and experimental methods are in good agreement, with the PDR method slightly underestimating the pile load increase
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