Abstract: 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.

Key words: u-shaped concrete roadway, groundwater level, buoyancy design measures, uplift resistance pile design