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<p>This study presented a displacement-based estimation model for evaluating the lateral load-bearing capacity of Combined Piled Raft Foundations (CPRF) subjected to constant vertical loading. Three-dimensional finite element analyses were performed to simulate various CPRF configurations in medium-dense sand. The model incorporates critical soil–structure interaction factors, including pile–pile, pile–raft, and raft–pile effects, to predict the lateral capacities of the raft and pile components individually. Results indicated that vertical loading significantly affects lateral behaviour, with CPRF with rigid connections (CPRF-R) exhibiting a 29% increase in front pile lateral load-sharing under a 128% increase in vertical load, while CPRF with hinged connections (CPRF-H) showed only a 7.5% increase. With the increase in vertical load, lateral displacements reduced by 75% in CPRF-R and 100% in CPRF-H. Bending moment profiles showed a 9% variation between the front and rear piles in CPRF-R and a 41% variation in CPRF-H. The estimation model reliably predicted lateral capacity across various geometric configurations and loading conditions. These findings improve understanding of soil–structure interaction and provide a reliable design approach for CPRFs in infrastructure projects subjected to both vertical and lateral forces.</p>

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Prediction Model for Assessing the Lateral Capacity of Combined Pile-Raft Foundations

  • 期刊论文

  • 发表日期：

    2025年7月14日

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  • Ujjawal Prakash,
  • Shashank Singh,
  • Shruti J. Shukla

摘要

This study presented a displacement-based estimation model for evaluating the lateral load-bearing capacity of Combined Piled Raft Foundations (CPRF) subjected to constant vertical loading. Three-dimensional finite element analyses were performed to simulate various CPRF configurations in medium-dense sand. The model incorporates critical soil–structure interaction factors, including pile–pile, pile–raft, and raft–pile effects, to predict the lateral capacities of the raft and pile components individually. Results indicated that vertical loading significantly affects lateral behaviour, with CPRF with rigid connections (CPRF-R) exhibiting a 29% increase in front pile lateral load-sharing under a 128% increase in vertical load, while CPRF with hinged connections (CPRF-H) showed only a 7.5% increase. With the increase in vertical load, lateral displacements reduced by 75% in CPRF-R and 100% in CPRF-H. Bending moment profiles showed a 9% variation between the front and rear piles in CPRF-R and a 41% variation in CPRF-H. The estimation model reliably predicted lateral capacity across various geometric configurations and loading conditions. These findings improve understanding of soil–structure interaction and provide a reliable design approach for CPRFs in infrastructure projects subjected to both vertical and lateral forces.