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<p>This study investigated the load-sharing behaviour of combined piled raft foundation systems subjected to vertical loading on cohesive soils using three-dimensional finite element modelling. Four configurations were analysed, an unpiled raft, an isolated pile, a 2 × 2 pile group, and a 2 × 2 combined piled raft, all supporting a 4&#xa0;m × 4&#xa0;m raft with 1-m thickness. The analysis aimed to compute the load contribution of each foundation component and develop predictive formulations based on component stiffness and settlement-dependent interaction factors, including pile-to-pile, raft-to-pile, and pile-to-raft effects. The results showed that the proportion of load carried by the raft and piles varied nonlinearly with increasing settlement due to developing soil-structure interactions. A stiffness-based model was&#xa0;further developed to estimate mobilized capacities and factor of safety under service-level settlement. The proposed model was then validated using results from previous studies and showed good agreement with reported trends. Interaction factors showed distinct functional relationships with normalized settlement, with pile-to-pile effects following a linear trend and raft-to-pile and pile-to-raft interactions showing non-linear behaviour.</p>

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Numerical Prediction of Component Load Contributions in Combined Piled Raft Foundations in Cohesive Soils Using Interaction Factors

  • 期刊论文

  • 发表日期：

    2025年8月14日

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  • Shashank Singh,
  • Ujjawal Prakash,
  • Navale Avinash Vitthal,
  • Bony Shashikumar Sharma,
  • Chandresh H. Solanki,
  • Shruti J. Shukla

摘要

This study investigated the load-sharing behaviour of combined piled raft foundation systems subjected to vertical loading on cohesive soils using three-dimensional finite element modelling. Four configurations were analysed, an unpiled raft, an isolated pile, a 2 × 2 pile group, and a 2 × 2 combined piled raft, all supporting a 4 m × 4 m raft with 1-m thickness. The analysis aimed to compute the load contribution of each foundation component and develop predictive formulations based on component stiffness and settlement-dependent interaction factors, including pile-to-pile, raft-to-pile, and pile-to-raft effects. The results showed that the proportion of load carried by the raft and piles varied nonlinearly with increasing settlement due to developing soil-structure interactions. A stiffness-based model was further developed to estimate mobilized capacities and factor of safety under service-level settlement. The proposed model was then validated using results from previous studies and showed good agreement with reported trends. Interaction factors showed distinct functional relationships with normalized settlement, with pile-to-pile effects following a linear trend and raft-to-pile and pile-to-raft interactions showing non-linear behaviour.