Geomechanics and Engineering

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Numerical study on the influence of embedment footing and vertical load on lateral load sharing in piled raft foundations

  • Sommart Swasdi (Department of Civil Engineering and Environment, Faculty of Engineering, Prince of Songkla University) ;
  • Tanan Chub-Uppakarn (Department of Civil Engineering and Environment, Faculty of Engineering, Prince of Songkla University) ;
  • Thanakorn Chompoorat (Department of Civil Engineering, School of Engineering, University of Phayao) ;
  • Worathep Sae-Long (Department of Civil Engineering, School of Engineering, University of Phayao)
  • Received : 2023.04.25
  • Accepted : 2024.02.27
  • Published : 2024.03.25
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Abstract

Piled raft foundation has become widely used in the recent years because it can increase bearing capacity of foundation with control settlement. The design for a piled raft in terms vertical load and lateral load need to understands contribution load behavior to raft and pile in piled raft foundation system. The load-bearing behavior of the piled raft, especially concerning lateral loads, is highly complex and challenge to analyze. The complex mechanism of piled rafts can be clarified by using three dimensional (3-D) Finite Element Method (FEM). Therefore, this paper focuses on free-standing head pile group, on-ground piled raft, and embedded raft for the piled raft foundation systems. The lateral resistant of piled raft foundation was investigated in terms of relationship between vertical load, lateral load and displacement, as well as the lateral load sharing of the raft. The results show that both vertical load and raft position significantly impact the lateral load capacity of the piled raft, especially when the vertical load increases and the raft embeds into the soil. On the same condition of vertical settlement and lateral displacement, piled raft experiences a substantial demonstrates a higher capacity for lateral load sharing compared to the on-ground raft. Ultimately, regarding design considerations, the piled raft can reliably support lateral loads while exhibiting behavior within the elastic range, in which it is safe to use.

Keywords

Acknowledgement

The authors gratefully acknowledge the financial support from the Faculty of Graduate School, Prince of Songkla University, through the Talent Utilization Type 1 Grant No. TU1-04/2564, Prince of Songkla University (ENG6601098S) and the National Research Council of Thailand and innovation fund and the university of Phayao (no. 231/2567). The authors would like to express sincere gratitude to Prince of Songkla University and Southern Natural Disaster Research Center for providing us with great support and resources in completing this study. We are grateful for their generous funding enabling us to conduct our investigation and complete this research. Furthermore, we extend our deepest thanks to the anonymous reviewers for their meticulous efforts and insightful suggestions, which have significantly enhanced the quality of this paper.

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