Design and Practice of Deep Excavation Engineering Adjacent to the Huangpu River in Shanghai

Shanghai is in soft soil area,which has thick silt soil and high underground water level.But along both sides of the Huangpu River,it has marshland soil in the shallow,which contains silty soil predominantly,and some areas contain much silk clay,the soil fabric is nonuniform and has high compressibility character in this area,different with the conventional regional soil in Shanghai.Taking the deep excavation projects of Shanghai Hejing International Plaza as the background,this paper introduces the selection and analysis ideas of supporting structure in deep excavation engineering which adjacent to the Huangpu River.Some special technologies has adopted in this project,including the construction of large diameter bored castin-place piles and waterproof curtains in marshland soil region,the design of the trestle bridge support system,the method of dewatering and excavation.The monitoring results show that the procedure of construction is safe and the deformation of surrounding facilities is under control.These solutions provide good reference for other similar projects in soft soil regions.