Steel pipe piles play a critical role in supporting many major infrastructure projects, from offshore wind turbines to waterfront structures and marine facilities. One reason engineers favor these piles is that they use less material than closed-ended piles while still providing strong load-carrying capacity. When a pile is pushed into clay, soil can enter the hollow interior of the pile and build up into what's known as a "soil plug." Understanding how and why that soil plug develops is important because it can affect how the pile behaves during installation and how it ultimately performs in the ground. In "New Method for Predicting Plug Development of Large-Diameter Steel Pipe Piles in Clay," authors Keke Ma, Shuai Yin, Hui Cheng, Hanlu Wang, Peipei Fang, Guojun Cai, Jiangtao Yi, and Wenchang Yan take a closer look at this often-overlooked process and explore ways to better predict it.
Using advanced computer modeling, the researchers studied how soil moves and how stresses develop around large-diameter pipe piles as they penetrate clay. They examined factors such as pile size and variations in clay strength and then used their findings to develop a new approach for predicting soil plug development. For professionals involved in marine, coastal, and offshore projects, this research offers a glimpse into emerging tools that could improve foundation planning and reduce uncertainty. Learn more about this study and how improved predictions can help engineers make more informed decisions about pile design, installation, and performance from the full article in the International Journal of Geomechanics at https://ascelibrary.org/doi/10.1061/IJGNAI.GMENG-13107. The abstract is below.
Abstract
Large-diameter steel pipe piles are widely used for both vertical and horizontal load-transfer applications, such as quay walls, offshore wind turbines, and mooring dolphins. This paper investigates the soil plug development of large-diameter steel pipe piles during penetration into clay using the coupled Eulerian–Lagrangian method. The distributions of vertical and radial stresses in the soil surrounding the pile tip during penetration are analyzed in detail. The influences of pile diameter and clay strength homogeneity on penetration resistance and plug evolution are systematically examined. The results indicate that soil plug development can be divided into three distinct stages: the initial upwelling stage, the partially plugged stage, and the approximately fully plugged stage. Compared with small-diameter steel pipe piles, the partially plugged state forms significantly earlier, while the transition to the fully plugged state is delayed. Furthermore, a new method based on radial stress analysis is proposed to predict soil plug development through data fitting. This method provides practical guidance and a valuable reference for the construction of monopile foundations in relevant engineering applications.
Get the details on how to better forecast soil plugs in steel piles in the ASCE Library: https://ascelibrary.org/doi/10.1061/IJGNAI.GMENG-13107.
