Abstract:Under the background that the existing land resources are not enough to carry the rapid development of the city and urban safety, as well as the increasingly prominent environmental problems, the development of deep underground space is an important means to resolve the construction conflicts and maintain the social stability. By investigating 6 deep underground space engineering cases of Suzhou River Deep Tunnel Storage Project, hard X-ray scientific experimental equipment, Jing'an Daning Parking Garage and so on built in Shanghai, the present situation and deficiency of deep underground space utilization in Shanghai are analyzed. Currently, the punctate foundation engineering (such as pile foundation) in Shanghai has entered deep underground space, and at the same time, the construction technologies of ultra-deep foundation pit, ultra-deep shaft and ultra-deep shield tunnel have been formed, but the development of functional deep underground space is less, and the exploration scope is mainly concentrated on the shallow deep underground space. The depth of burial has not yet exceeded 60 m. Compared with the international developed cities, there is a gap in deep utilization, lack of systematic planning and institutional support, deep geotechnical physical theory has not been established, and the development technology of soft soil deep underground space has not been verified. In view of the shortage and the construction conditions characteristics of wide distribution of sandy soil, high confined water and high environmental protection requirements in Shanghai, the construction of future underground deep space development in Shanghai facing the technical challenges such as the control of deep confined water, construction of shaft and construction of shield tunnel, overburden water control, shaft construction, and shield tunnel construction is discussed.
