ABSTRACT
In order to prepare the 2010 EXPO, construction activities of civil infrastructures and buildings in the municipality of Shanghai have been increased significantly. To meet the demands of high efficiency city traffic, extensive underground metro system in Shanghai has been rapidly constructed. How to accomplish the target of completing 400 km network in both quick and satisfactory way under the situation of large scale and high risk becomes a question to the constructors in Shanghai. Many problems during construction have been researched by many researchers and engineers over the years (Liu & Hou 1997; Liu et al. 1999; Liu et al. 2000, 2001). But few reports about the design of retaining structures of excavations are analyzed. Some retaining structure design schemes of normal metro station excavations which have the similar geological and structural situations are selected. According to the results of field monitoring (e.g. strut load, bending moment in diaphragm wall deduced from lateral deformation curves), the rationality of designs are analyzed. A series of software, calculating models, methods and parameters can be summarized, and key factors affecting the correctness of the design are emphasized. The
intention of this paper is optimizing design methods satisfy demands of safety and economy. These suggestions help improve design of retaining structures for deep excavations so that the design standard in Shanghai can be unified gradually.
