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Negative Skin Friction (NSF) is a vital aspect in the pile design, particularly when it is constructed in soft soil. One factor responsible for this phenomenon is the addition of a surcharge load on the soil adjacent to the pile. This loading will lead to a downward drag force on the pile shaft due to the soil settling relatively more than the pile. To evaluate the complex interaction between the pile and the surrounding soil, Plaxis 2D is used to provide fundamental information to assess the pile NSF and the location of the Neutral Plane (NP) due to the influence of the combined effects of vertical Pile Loads (PL) and surface Surcharge Load (SL). This study investigates the use of both relative movement and finite element modelling to evaluate the effect of PL and SL under different scenarios on the pile-soil interaction, aiming to quantify the location of the NP and the NSF along the pile. The results illustrate that NSF and NP were altered through of changes the PL or/and SL. The NP location moved up with increasing PL, while it moved down with increasing SL. The fluctuation of the NP affects on the magnitude of NSF leading to change the bearing capacity of pile foundation. In addition, the relationship between two ways to calculate the NSF was very strong due to the correlation coefficient (R2) recorded as 0.99.

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Quantifying Negative Skin Friction Along Pile Under Axial Load and Surface Surcharge

  • 会议论文

  • 发表日期：

    2026年

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  • Hayder A. Hasan,
  • Malik H. Assi,
  • Faris Waleed Jawad,
  • Hadi Khabbaz

摘要

Negative Skin Friction (NSF) is a vital aspect in the pile design, particularly when it is constructed in soft soil. One factor responsible for this phenomenon is the addition of a surcharge load on the soil adjacent to the pile. This loading will lead to a downward drag force on the pile shaft due to the soil settling relatively more than the pile. To evaluate the complex interaction between the pile and the surrounding soil, Plaxis 2D is used to provide fundamental information to assess the pile NSF and the location of the Neutral Plane (NP) due to the influence of the combined effects of vertical Pile Loads (PL) and surface Surcharge Load (SL). This study investigates the use of both relative movement and finite element modelling to evaluate the effect of PL and SL under different scenarios on the pile-soil interaction, aiming to quantify the location of the NP and the NSF along the pile. The results illustrate that NSF and NP were altered through of changes the PL or/and SL. The NP location moved up with increasing PL, while it moved down with increasing SL. The fluctuation of the NP affects on the magnitude of NSF leading to change the bearing capacity of pile foundation. In addition, the relationship between two ways to calculate the NSF was very strong due to the correlation coefficient (R2) recorded as 0.99.