Abstract: Box culvert jacking has been widely used in the urban utility projects. The strengthening of surrounding soils is critical to the success and quality of the entire jacking project. This paper presents a case history of jacking a rectangular subway aprons of D2 station at Xinan Park of No. 12 metro line in Shenzhen. The principles of strengthening of jacking pit, receiving pit and surrounding zone are introduced. The soil strengthening in the jacking process was numerically simulated and the ground subsidence during the entire jacking process was obtained. The results indicate that, with the jacking process, the ground surface settlement increased until the No. 14 segment was installed. Thereafter, the ground subsidence became stable. The maximum measured ground settlement was 16 mm and this settlement value satisfied the code requirement.

Key words: Subway Aprons, Rectangular Box Jacking, Soft Soil Improvement, Numerical Simulation