Design and analysis of retaining structures for a super-deep excavationin Shanghai using late-dismantling support

For a super-deep excavation in Shanghai, the application of late-dismantling support in the design of retaining structures is introduced. The difficulties of the design and construction are analyzed, and the relevant solutions are given. A comparison among numerical simulations, theoretical results and engineering data shows that the results are close, and the monitoring data do not exceed the warning values. The influences of pit excavation on the surrounding environment can meet the requirements of specification. The design method is successfully used in this project and achieves satisfactory effects. It will provide some reference for the design and construction of similar projects.