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<p>This study evaluated the performance of connected and unconnected piled raft foundations through numerical analysis under vertical load condition. Key parameters examined included settlement ratio, cushion thickness, cushion stiffness, and soil–pile interaction. In connected piled raft foundations, the load carried by the piles decreased as settlement increased; while, the load supported by the raft increased nonlinearly, with the raft bearing a greater portion of the load at higher settlement levels. Unconnected piled raft foundations exhibited greater settlement, which decreased as cushion thickness increased up to a certain point, then increased again, indicating sensitivity to cushion–soil interaction. The stiffness and thickness of the cushion material significantly influenced settlement in unconnected piled raft foundations. Increased cushion stiffness improved load transfer efficiency, reducing overall settlement. Maximum axial load in connected piled raft systems occurred at the pile head, while in unconnected systems, it shifted to a depth of 5&#xa0;m below the pile head due to the cushion layer. The load carried by piles in unconnected piled raft foundations was approximately 60% lower than in connected systems. Additionally, unconnected systems experienced negative skin friction, further reducing pile capacity.</p>

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A Finite Element Analysis on the Performance and Load Sharing Mechanism of Unconnected Piled Raft Foundation on Cohesive Soil

  • 期刊论文

  • 发表日期：

    2025年1月30日

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  • Shashank Singh,
  • Chandresh H. Solanki,
  • Shruti J. Shukla

摘要

This study evaluated the performance of connected and unconnected piled raft foundations through numerical analysis under vertical load condition. Key parameters examined included settlement ratio, cushion thickness, cushion stiffness, and soil–pile interaction. In connected piled raft foundations, the load carried by the piles decreased as settlement increased; while, the load supported by the raft increased nonlinearly, with the raft bearing a greater portion of the load at higher settlement levels. Unconnected piled raft foundations exhibited greater settlement, which decreased as cushion thickness increased up to a certain point, then increased again, indicating sensitivity to cushion–soil interaction. The stiffness and thickness of the cushion material significantly influenced settlement in unconnected piled raft foundations. Increased cushion stiffness improved load transfer efficiency, reducing overall settlement. Maximum axial load in connected piled raft systems occurred at the pile head, while in unconnected systems, it shifted to a depth of 5 m below the pile head due to the cushion layer. The load carried by piles in unconnected piled raft foundations was approximately 60% lower than in connected systems. Additionally, unconnected systems experienced negative skin friction, further reducing pile capacity.