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<p>With the growing scale of deep water bridge foundation construction, cofferdam bottom-sealing structures have become increasingly important for uplift resistance. The interfacial bond performance between steel pipe piles and bottom-sealing concrete has become a critical factor affecting construction safety. To investigate the interfacial bond behavior and influencing factors, model tests, bonding mechanism analyses, and finite element simulations were conducted based on a realistic bridge main tower foundation project. Different conditions, including uncoated and coated steel pipe surfaces and dry and underwater casting environments, were considered. Their effects on interfacial bond capacity, load-displacement behavior, and strain distribution were comparatively analyzed. The components of interfacial bond resistance, bond-slip evolution, and the distribution of bond stress along the pile height were further investigated. A staged bond-stress distribution function and an equivalent method for calculating ultimate bond capacity were proposed. Finite element analyses were further conducted to evaluate the effects of pile-top concrete strength, riverbed conditions, and layered casting on interfacial behavior. The results indicate that the interfacial bonding process can be divided into three stages: complete bonding, partial bonding, and slip failure. Anticorrosion coatings reduce the initial bond capacity but improve the ultimate bond resistance. Underwater casting significantly weakens interfacial bond performance. Interfacial bond resistance consists of chemical adhesion, mechanical interlocking, and friction, gradually becoming friction-dominated with increasing slip. Bond stress exhibits staged distribution characteristics along the pile height. The proposed ultimate bond-capacity model agrees well with the experimental results. Increasing the strength of pile-top concrete enhances the interfacial load-carrying capacity, whereas layered casting aggravates stress concentration and reduces bonding performance. The findings provide guidance for cofferdam bottom-sealing construction in similar deep water bridge foundations.</p>

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Investigation of the interfacial bond behavior of steel pipe pile and bottom-sealing concrete under realistic cofferdam construction conditions

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年8月5日

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  • Hao Wu,
  • Jia Liu

摘要

With the growing scale of deep water bridge foundation construction, cofferdam bottom-sealing structures have become increasingly important for uplift resistance. The interfacial bond performance between steel pipe piles and bottom-sealing concrete has become a critical factor affecting construction safety. To investigate the interfacial bond behavior and influencing factors, model tests, bonding mechanism analyses, and finite element simulations were conducted based on a realistic bridge main tower foundation project. Different conditions, including uncoated and coated steel pipe surfaces and dry and underwater casting environments, were considered. Their effects on interfacial bond capacity, load-displacement behavior, and strain distribution were comparatively analyzed. The components of interfacial bond resistance, bond-slip evolution, and the distribution of bond stress along the pile height were further investigated. A staged bond-stress distribution function and an equivalent method for calculating ultimate bond capacity were proposed. Finite element analyses were further conducted to evaluate the effects of pile-top concrete strength, riverbed conditions, and layered casting on interfacial behavior. The results indicate that the interfacial bonding process can be divided into three stages: complete bonding, partial bonding, and slip failure. Anticorrosion coatings reduce the initial bond capacity but improve the ultimate bond resistance. Underwater casting significantly weakens interfacial bond performance. Interfacial bond resistance consists of chemical adhesion, mechanical interlocking, and friction, gradually becoming friction-dominated with increasing slip. Bond stress exhibits staged distribution characteristics along the pile height. The proposed ultimate bond-capacity model agrees well with the experimental results. Increasing the strength of pile-top concrete enhances the interfacial load-carrying capacity, whereas layered casting aggravates stress concentration and reduces bonding performance. The findings provide guidance for cofferdam bottom-sealing construction in similar deep water bridge foundations.