【摘要】 为解决常规钢板桩围堰遇坚硬土层插打难度大及锁口钢管桩围堰止水效果差的问题，提出一种装配式钢管-钢板桩围堰，充分利用了钢管桩刚度大、钢板桩止水效果好的优点.通过ABAQUS对该结构进行数值分析表明，角部的钢管桩极大改善了钢板桩围堰角部剥脱以及对支撑依赖度高的不足，增加钢管桩数量可以改善结构受力情况. 3道支撑尤其是封底混凝土对抑制钢板桩变形的发展最有效.同时，该结构可以有效抑制河床土体的变形.土体最大水平和竖向变形集中在抽水初始阶段和清淤阶段，分别占最大变形的89.9%和65.2%，结构的3道支撑与封底混凝土可以很好地抑制抽水与清淤阶段变形.更多还原

【Abstract】 To address the challenges faced by conventional steel-sheet pile cofferdams when driving into hard soil layers and the poor water-stopping effect of interlocking steel-tubular piles, a prefabricated steel-tubular and steel-sheet pile cofferdam was proposed, which fully utilized the advantages of high stiffness of steel-tubular piles and good water-stopping effect of steel-sheet piles. The numerical analysis of the structure using Abaqus shows that the steel-tubular piles at the corners greatly improve the peeling of the steel-sheet pile cofferdam corners and the high dependence on support. Increasing the number of steel-tubular piles can greatly improve the structural stress condition. Three supports, especially the bottom sealing concrete, are the most effective in suppressing the development of steel-sheet pile deformation. At the same time, this structure can effectively suppress the deformation of the riverbed soil. The maximum horizontal and vertical deformation of the soil occur mainly during the initial pumping stage and the dredging stage, accounting for 89. 9% and 65. 2% of the maximum deformation, respectively. The three supports and bottom sealing concrete of the structure can effectively suppress deformation during the pumping and dredging stages.更多还原