Abstract: The elliptical internal supporting structure is a typical compressive element and the material properties of reinforced concrete can be fully utilized. However, under the uneven loading conditions, large bending moments and excessive deformation might be generated so that the application of this supporting type has many limitations. Currently, the elliptical supporting structure is rarely used in deep excavations with depth greater than 20 meters in nearshore reclaimed areas. This paper presents the application of reinforced concrete elliptical structure as the supporting structure for a 27 meters deep excavation in the reclaimed area. The threedimensional numerical analysis was used to simulate the performance of elliptical supporting structure with various aspect ratio. The deformation and stress conditions in the internal supporting structures are also investigated. The results indicate that, under the uneven loading conditions, with the increase of aspect ratio, large deformation and stress are observed in the supporting structure. Increase the cross strut supporting in the short direction can effectively reduce the deformation and bending moment.

Key words: Reclamed Area, Deep Excavation, Elliptic Ring Supporting Structure, Numerical Analysis