某下穿铁路的U型槽抗浮设计

Buoyancy Resistance Design of U-shaped Concrete Roadway under a Railway

随着城市路网的发展,U型槽在道路交通工程中得到越来越多的应用。在地下水位比较高的路段,U型槽设计的一个重要方面就是要考虑抗浮设计。该问题目前在相关规范中还没有明确统一的规定,各设计单位的算法也不尽一致,因此有必要对U型槽的抗浮设计进行探讨。结合武汉某下穿铁路的道路工程U型槽段的抗浮设计,对设计水位、浮力计算、抗拔力计算、抗浮措施选择、抗浮桩设计等问题进行了探讨,最终确定采用结构自重+抗浮桩方案来解决U型槽抗浮问题。实践证明,该方法合理可行,可为工程实践中类似结构的抗浮设计提供参考。

With the development of the highway networks in the urban area,the U-shaped concrete roadway is a useful structure in the transportation engineering applications.When this structure is applied in area with high groundwater,one of the most important aspect is the design for the buoyancy.There is no uniform design method defined in the design code and different consults have significantly different design approach.This paper presents a design approach for the uplift resistance of the U-shaped concrete roadway structure with a case history of a highway alignment underneath a railroad.The aspects of design groundwater level,buoyancy estimation,uplift resistance and the uplift resistance pile are discussed in the paper.The final design approach utilized the self-weight combined with the uplift resistance pile for the buoyancy design.It is concluded that this approach was successful.