随着导管架平台的应用尺度和重量不断增加，导管架平台桩基础逐渐表现出超长桩的特性，给长桩基础打桩过程中的自由站立分析带来了新的挑战。为了校核长桩基础的自由站立稳定性，明确打桩过程中的桩身变形特性，建立了考虑桩土相互作用的桩身受力分析模型，借鉴压杆稳定理论推导了桩身挠曲变形微分方程，探究了桩基入泥深度、桩基尺寸以及地基反力模量对桩身变形的影响。研究结果表明：桩基入泥深度、桩径以及壁厚的增加提高了桩基础的截面刚度，导致桩身变形随着桩基入泥深度、桩径以及壁厚的增加而减小；地基反力模量的增大有利于改善桩身变形，但改善效果随着地基反力模量的进一步增大而不断衰减。研究成果为长桩基础的自由站立分析提供了一种考虑桩土相互作用的新的理论方法，能够更好地反映工程实际，可为长桩基础的打桩分析提供参考。

英文摘要:

With the increasing scale and weight of jacket platforms, their pile foundations are gradually exhibiting the characteristics of ultra-long piles, which presents new challenges for free-standing analysis during the pile driving process. To verify the free-standing stability and clarify the deformation characteristics of long pile foundations during pile driving, a force analysis model considering pile-soil interaction was established. The differential equation for pile deflection was derived based on the stability theory of compression bars, and the influence of penetration depth, pile size, and foundation reaction modulus on pile deformation was explored. The research results indicate that increases in penetration depth, pile diameter, and wall thickness enhance the cross-sectional stiffness of the pile foundation, thereby reducing pile deformation. While increasing the foundation reaction modulus is beneficial for reducing pile deformation, the improvement effect diminishes with further increases in the modulus. These findings provide a new theoretical method that incorporates pile-soil interaction for the free-standing analysis of long pile foundations, offering a better reflection of engineering practice and a reference for pile driving analysis of long pile foundations.

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