锁扣钢管桩围堰在我国桥梁深水基础施工中应用广泛,然而当前对斜坡地基条件下钢管桩围堰结构施工变形特性鲜有研究。以浙江建德市新安江大桥基础锁扣钢管桩围堰施工为背景,采用Midas Civil建立斜坡地基钢管桩围堰施工全过程三维有限元数值模型,与现场实测数据进行了模型验证,分析了斜坡地基钢管桩围堰结构在施工过程中的变形规律,研究了倾斜地基、施工工艺和水流流速对侧向变形的影响,最后通过合理优化围护结构尺寸对结构变形进行有效控制。结果表明:斜坡地基下的钢管桩围堰由于约束形式的差异导致结构的侧向位移相差较大;相较于分层下放工艺,整体下放工艺中各层围檩协同作用可有效减弱变形累加效应;与水流因素相比,斜坡地基因素对围堰的影响更为显著;综合考虑变形控制与材料用量,可通过合理设计维护体系的尺寸对围堰结构进行有效的优化。研究成果可对相似地质条件下深水桥梁基础设施提供理论参考。
Locking steel pipe pile cofferdams are widely used in deepwater bridge foundation construction in China. However, limited studies have examined their deformation characteristics under sloped foundation conditions. This study investigates the construction of a steel pipe pile cofferdam for the Xin'anjiang Bridge foundation in Jiande City, Zhejiang Province. A three-dimensional finite element model of the entire construction process is developed using Midas Civil and validated against on-site measurements. The analysis explores the deformation behavior of the cofferdam during construction and evaluates the effects of foundation inclination, construction techniques, and water flow velocity on lateral deformation. Finally, the deformation of the structure was effectively controlled by reasonably optimizing the size of the retaining structure. The results indicate that: Lateral displacement varies significantly due to differences in constraint conditions; Compared to the layered lowering method, the overall lowering approach mitigates cumulative deformation through the synergistic effect of each layer of purlins; Furthermore, the influence of the foundation inclination on cofferdam stability is more pronounced than that of water flow velocity; By optimizing the size of the maintenance system and balancing deformation control with material efficiency, cofferdam performance can be effectively improved. The findings of this study provide theoretical guidance and practical data for deepwater bridge foundation construction under similar geological conditions.
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