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<p>The Combined Pile-Raft Foundation (CPRF) system offers an efficient geotechnical solution by mobilizing both raft and pile contributions to resist vertical loads. This study presents a detailed numerical analysis of CPRF performance under static vertical loading using finite element methodbased Plaxis 3D software. In this study, the structural components (raft and piles) of CPRF were modeled using 3D volume elements, with their material behavior assumed to be linear elastic. Two distinct numerical models were developed to evaluate the performance of the CPRF system. The first model involved a large-scale CPRF embedded in a homogeneous Toyoura sand deposit, while the second model considered a CPRF system placed within a layered soil profile comprising a loose sand layer overlying dense sand. For both models, key performance parameters, vertical load-carrying capacity (VLCC) and load-sharing coefficient (LSC), were systematically evaluated. Additionally, the effect of various parameters such as pile configuration, raft thickness, pile slenderness ratio and the thickness of loose sand layer was investigated. Results demonstrate that LSC increases with larger pile groups and greater pile slenderness ratio, while raft thickness has minimal influence. VLCC also increases with pile slenderness ratio, particularly for dense pile configurations. The introduction of loose sand layer significantly impacts the performance of CPRF. These findings enhance the understanding of CPRF behavior in layered soils and support optimized design strategies for complex subsurface conditions.</p>

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Effect of Different Configurations of Combined Pile-Raft Foundation on Vertical Load-Carrying Capacity and Load Sharing

  • 期刊论文

  • 发表日期：

    2025年9月9日

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  • Aman Garg,
  • Vishwas A. Sawant

摘要

The Combined Pile-Raft Foundation (CPRF) system offers an efficient geotechnical solution by mobilizing both raft and pile contributions to resist vertical loads. This study presents a detailed numerical analysis of CPRF performance under static vertical loading using finite element methodbased Plaxis 3D software. In this study, the structural components (raft and piles) of CPRF were modeled using 3D volume elements, with their material behavior assumed to be linear elastic. Two distinct numerical models were developed to evaluate the performance of the CPRF system. The first model involved a large-scale CPRF embedded in a homogeneous Toyoura sand deposit, while the second model considered a CPRF system placed within a layered soil profile comprising a loose sand layer overlying dense sand. For both models, key performance parameters, vertical load-carrying capacity (VLCC) and load-sharing coefficient (LSC), were systematically evaluated. Additionally, the effect of various parameters such as pile configuration, raft thickness, pile slenderness ratio and the thickness of loose sand layer was investigated. Results demonstrate that LSC increases with larger pile groups and greater pile slenderness ratio, while raft thickness has minimal influence. VLCC also increases with pile slenderness ratio, particularly for dense pile configurations. The introduction of loose sand layer significantly impacts the performance of CPRF. These findings enhance the understanding of CPRF behavior in layered soils and support optimized design strategies for complex subsurface conditions.