地下水丰富地区的下钻式立交,一般需要设置封闭式路堑U形槽结构,而U形槽的设计首先需解决抗浮问题。该文结合实际工程,采用将U形槽结构看成一个整体的方法,对整体进行受力分析,通过对U形槽所受各方面的力的计算,确定U形槽结构形式,采用桩基摩擦理论,并通过群桩效用验算、局部抗浮验算以及裂缝宽度验算,最终确定采用结构自身重力+抗拔桩联合抗浮解决大断面U形槽抗浮问题。实践证明,此U形槽设计方法比较合理,可为此类结构的设计提供参考和借鉴。 Underground drilling in the rich areas of underpass, the general need to set up a closed-cut U-shaped groove structure, and U-shaped groove design must first solve the anti-floating problem. According to the actual project, U-shaped groove structure is taken as a whole method, and the force analysis is carried out on the whole. By calculating the force in all aspects of U-shaped groove, the structure of U- Friction theory, and through the pile group check, partial anti-floating calculation and crack width checking, finally determine the use of the structure of their own gravity + anti-floating pile joint anti-floating solution U-shaped tank anti-floating problem. Practice has proved that this U-groove design method is more reasonable for the design of such structures provide a reference and reference.