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There is a dearth of reliable field data that can be used to assist the improvement of design methods for axial capacity assessments of large-scale monopiles. This paper presents a numerical investigation of monopiles in clay, focusing on the development of internal and external shaft friction during and after a jacked installation process. A centrifuge test of a model monopile in a saturated kaolin sample is modelled with Press-Replace Method (PRM), which is employed in finite-element software to simulate pile installation. The installation simulation is followed by equalisation and load testing phases. The numerical analysis implemented an advanced constitutive model S-CLAY1S to capture the destructuration of the soil next to the pile shaft due to the large shear strains imposed during installation. The numerical approach allows the stress changes over the life stages of a monopile to be evaluated, as well as providing insights into the relative magnitudes of internal and external shaft friction.

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Predicting the Shaft Capacity of Monopiles in Soft Clay Using the Press-Replace Finite Element Method

  • 会议论文

  • 发表日期：

    2026年

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  • Aflizal Arafianto,
  • Barry M. Lehane,
  • Phillip G. Watson

摘要

There is a dearth of reliable field data that can be used to assist the improvement of design methods for axial capacity assessments of large-scale monopiles. This paper presents a numerical investigation of monopiles in clay, focusing on the development of internal and external shaft friction during and after a jacked installation process. A centrifuge test of a model monopile in a saturated kaolin sample is modelled with Press-Replace Method (PRM), which is employed in finite-element software to simulate pile installation. The installation simulation is followed by equalisation and load testing phases. The numerical analysis implemented an advanced constitutive model S-CLAY1S to capture the destructuration of the soil next to the pile shaft due to the large shear strains imposed during installation. The numerical approach allows the stress changes over the life stages of a monopile to be evaluated, as well as providing insights into the relative magnitudes of internal and external shaft friction.