In offshore structures, vertical loads act permanently, whereas varying amount of lateral loads acts due to the wind, waves, or both, resulting in large lateral movement of the pile foundation. To overcome the problem, batter pile foundations seem to be a good alternative to the vertical pile foundation. Batter piles are known to have higher lateral load capacity when subjected to high lateral loads. In the current model study, the response of vertical and batter pile groups was analyzed when subjected to lateral, vertical, and combined loads. The model piles and the tank were fabricated with aluminum and mild steel, respectively. The piles exhibit 18 mm outer diameter and varying lengths (288, 468, and 648 mm). Pile groups were physically modeled to avoid the boundary condition effects. Pile groups having 2 piles with one pile vertical and another with varying angles, viz. 0°, 15°, 25°, 35°, and 45° were considered in the study. The piling groups ultimate load capacities were determined by analyzing load-displacement curves. Pile groups having −35° angle provide maximum resistance to loads. However, further increase of the angle leads to a marginal decrease in the ultimate load capacity of the pile group. Furthermore, when the pile group is modeled numerically, the findings closely match with the model test.

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Experimental and Numerical Analysis of Vertical and Batter Pile Groups Under Combined Lateral and Vertical Loads in Sandy Soil

  • Rishi,
  • Pankaj Bajaj,
  • Renu Premjani,
  • Laxmikant Yadu

摘要

In offshore structures, vertical loads act permanently, whereas varying amount of lateral loads acts due to the wind, waves, or both, resulting in large lateral movement of the pile foundation. To overcome the problem, batter pile foundations seem to be a good alternative to the vertical pile foundation. Batter piles are known to have higher lateral load capacity when subjected to high lateral loads. In the current model study, the response of vertical and batter pile groups was analyzed when subjected to lateral, vertical, and combined loads. The model piles and the tank were fabricated with aluminum and mild steel, respectively. The piles exhibit 18 mm outer diameter and varying lengths (288, 468, and 648 mm). Pile groups were physically modeled to avoid the boundary condition effects. Pile groups having 2 piles with one pile vertical and another with varying angles, viz. 0°, 15°, 25°, 35°, and 45° were considered in the study. The piling groups ultimate load capacities were determined by analyzing load-displacement curves. Pile groups having −35° angle provide maximum resistance to loads. However, further increase of the angle leads to a marginal decrease in the ultimate load capacity of the pile group. Furthermore, when the pile group is modeled numerically, the findings closely match with the model test.