Abstract:At present, there are a large number of urban underpass tunnels in China. However, due to the great difference of hydrogeological conditions among cities, the existing engineering design and construction experience cannot be mechanically copied, but should be combined with the characteristics of the project itself and the surrounding environment to carry out targeted research. It is vital how to effectively balance the proper discharge of groundwater and the reasonable unity of safety and economy of lining structure for the tunnel design. However, the study on key technologies of waterproof and drainage system and waterproof lining design in the process of urban underground space construction is not systematic, and there are no mature data for reference at home and abroad. Based on this, relying on the complex hydrogeological tunnel in the connecting line of transit expressways in the east of Shenzhen, the water pressure distribution characteristics and structural bearing mechanisms of the different waterproof and drainage schemes are studied and analyzed by FLAC3D software, and the design method of reasonable waterproof and drainage system and waterproof lining in the supported project in order to guide the follow-up engineering design and ensure the safety of engineering construction and operation.
