异型群桩水流载荷遮掩效应受力分析

中马友谊大桥采用群桩基础，洋流经过群桩时会产生纵向和横向位移。为了探索异型群桩水流载荷计算方法，通过单向水槽模型试验测量单桩、双桩水流载荷，提出异型群桩水流载荷公式，并结合群桩水流载荷试验结果验证计算公式的合理性。结果表明，并列双桩水流载荷随着桩心距增加而减小，桩心距大于5D时，双桩之间干扰效应消失；串联双桩中后桩水流载荷随着桩心距增加而增加，桩心距大于20D时，双桩之间遮掩效应减弱；随着流向角增加，后桩受到的水流载荷呈正弦分布，且随着桩心距变化出现不同趋势。

Force analysis of isomerism pile group under flow load shielding effect

China-Maldives Friendship Bridge adopts a pile group foundation, and vertical and horizontal displacements appear when the ocean current passes the pile group. In order to explore the calculation method of the flow load of the isomerism pile group, this paper measures the flow load of single and double piles by a one-way tank model test, proposes a formula for the flow load of the isomerism pile group, and verifies the rationality of the formula according to the test results of flow load of pile group. The results show that the flow load of the parallel two piles decreases with the increase in the pile center distance, and the interference effect between the two piles disappears when the pile center distance is greater than 5D. In addition, the flow load of the back pile of two piles in series increases with the increase in the pile center distance, and the shielding effect between the two piles weakens when the pile center distance is greater than 20D. With the increase in the angle of current, the flow load of the back pile presents a sinusoidal distribution, and different trends appear with the change of pile center distance.