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Numerical Modeling of Pile Bearing Capacity and Group Efficiency under Axial Loading

Mahvelati Shams Abadi, Siavash | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45914 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Ahmadi, Mohammad Mehdi
  7. Abstract:
  8. Bearing capacity of piles depends on many factors among which geometrical properties of piles, soil type, and strength properties of soil are of great importance. Based on these parameters, several approaches have been developed in order to overcome the uncertainty in the prediction of pile bearing capacity. Studies carried out in this area or research can be divided into two main categories: first, laboratory based approaches, and second, numerically based approaches. The research followed in the present study is based on numerical modeling. In this study, a single pile is initially modeled in the axisymmetric configuration and its bearing capacity is determined. The results of the model were then verified with a full scale pile load test performed by previous researchers reported in the literature. The same approach is carried out for single pile and pile group modeling in 3D modeling condition, and the numerical results obtained in this study were verified by using the results of a pile load test on a single pile and pile group. By changing the geometrical and material parameters of the problem, various bearing capacities are obtained. By having single pile and pile group bearing capacities for different conditions, one can simply calculate the pile group efficiency for several pile group layouts. Moreover, in this project, factors which can affect pile group behavior are studied, and the contributing factors affecting single pile/pile group bearing capacities are investigated. All these numerical simulations led to a considerable number of numerical analyses for estimating pile group efficiencies for various pile group layouts. Eventually, efforts were made to present mathematical approaches for estimating pile group efficiency. In this regard, two approaches are developed, and advantages and disadvantages are discussed for each approach. The ABAQUS program has been used for all the numerical analyses carried out in this study
  9. Keywords:
  10. Numerical Modeling ; Axial Loads ; Granular Soil ; Pile Bearing Capacity ; Pile Group Efficiency

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