Practices of central island with inclined bracings for super-large excavations in soft-soil areas

The application of the excavation method of central island with inclined bracings in No. 125-2 Pujiang Town, Shanghai with an area of 40000 m2 is introduced. The selection condition, operating model flow and FEM numerical analysis are presented. The key techniques including surrounding slope protection in passive soils, force resistance system of foundation plates and deformation control within support replacement are highlighted. In the end, based on the analysis and summarization of monitoring results, some reasonable opinions are given. The experience and conclusions may be helpful to the design, construction and research of similar or even larger projects in the future.