为研究围堰两侧水土压力不对称以及渗流力对桥梁围堰的影响，以南昌复兴大桥桥梁围堰为研究对象，基于流固耦合理论，研究偏压组合作用下锁扣钢管桩的受力变形规律，通过建立围堰降水开挖全过程三维数值分析模型，分别从钢管桩长度、堰外水位高度、地势起伏角度三方面进行研究。研究结果表明：随地势起伏角度增加，偏压侧土体最大变形量逐渐减小，非偏压侧土体最大变形量逐渐增大。随着水位高度的增加，偏压侧与非偏压侧钢管桩水平位移最大值呈线性增长，同时堰内超静孔隙水压力随水位上升呈加速增长趋势。随钢管桩长度减小，围堰整体产生向偏压侧倾转趋势；两侧钢管桩桩身最大负弯矩随钢管桩减小而减小，桩身受力模式发生改变。

To study on the asymmetric water and soil pressure on both sides of the cofferdam and the influence of seepage force on the bridge cofferdam, the Nanchang Fuxing Bridge cofferdam was taken as the research object. Based on the fluid structure coupling theory, the deformation law of the locking steel pipe piles under the action of biased pressure combination was studied. A three-dimensional numerical analysis model of the entire process of cofferdam dewatering and excavation was established, and the study was conducted from three aspects: the length of the steel pipe piles, the height of the water level outside the cofferdam, and the angle of terrain undulation. The research results indicate that as the terrain undulation angle increases, the maximum deformation of the soil on the biased side gradually decreases, while the maximum deformation of the soil on the non biased side gradually increases. With the increase of water level height, the maximum horizontal displacement of steel pipe piles on the biased and non biased sides increases linearly, and at the same time, the excess pore water pressure inside the dam accelerates with the rise of water level. As the length of the steel pipe pile decreases, the cofferdam as a whole tends to tilt and turn towards a biased direction. The maximum negative bending moment of the steel pipe piles on both sides decreases as the steel pipe piles decrease, and the stress mode of the pile body changes.