Helical Piles or helical anchors are used as foundations for towers, and structures, to augment retaining walls either for new or existing structures. Helical piles are one of the successful techniques used for the restoration of the structure because of their several advantages over other techniques. Similar to conventional piles, helical piles are also subjected to different loads such as compression, uplift, and lateral forces simultaneously rather than supporting separate loads, combined loads also act on the piles in some cases. Hence the combined loading analysis is necessary to comprehend the behavior of helical piles. This paper presents three-dimensional finite element analyses of the helical pile’s behavior embedded in soft clay subjecting to combined uplift and lateral loads. From the series of 3D FEM analyses using Plaxis 3D software results, it is found that the application of uplift load decreases the lateral capacity and also increases the lateral deformation. It is also found that increasing the number of plates has less effect on the lateral response of helical piles under uplift loading. The uplift capacity of the helical pile seems to increase when lateral load is applied. The maximum increase in capacity is found to be 10% and this may be due to an increase in uplift and bearing resistance offered by the helical plates, when subjected to lateral loads.

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Numerical Analysis of Single Helical Pile Subjected to Combined Loading

  • Vignesh Venkatesan,
  • M.Muthukumar

摘要

Helical Piles or helical anchors are used as foundations for towers, and structures, to augment retaining walls either for new or existing structures. Helical piles are one of the successful techniques used for the restoration of the structure because of their several advantages over other techniques. Similar to conventional piles, helical piles are also subjected to different loads such as compression, uplift, and lateral forces simultaneously rather than supporting separate loads, combined loads also act on the piles in some cases. Hence the combined loading analysis is necessary to comprehend the behavior of helical piles. This paper presents three-dimensional finite element analyses of the helical pile’s behavior embedded in soft clay subjecting to combined uplift and lateral loads. From the series of 3D FEM analyses using Plaxis 3D software results, it is found that the application of uplift load decreases the lateral capacity and also increases the lateral deformation. It is also found that increasing the number of plates has less effect on the lateral response of helical piles under uplift loading. The uplift capacity of the helical pile seems to increase when lateral load is applied. The maximum increase in capacity is found to be 10% and this may be due to an increase in uplift and bearing resistance offered by the helical plates, when subjected to lateral loads.