Abstract: The sewer transferring systems engineering in the core area of Greater East Lake is the first deep embedded tunnel for sewer transferring project in Wuhan, which is predominantly constructed by the shielded tunneling method. This paper presents a case history of the sewer transmission system project in the core area of Greater East Lake. The geotechnical investigation methods of the deeply embedded tunnel excavation in the karst terrain of Wuhan city is discussed. Through the data collection and engineering geological mapping and survey, the regional geological and hydrogeological conditions can be quantified. The geotechnical investigation methods combined the geotechnical drilling and samples, as well as insitu testing methods for the soil stratigraphy, the condition of karstic bedrock and hydrogeological conditions of the project site. The specialty investigation methods, such as electromagnetic wave computer tomography (CT) scan, borehole color television, hydrogeological testing, hydrological survey and laboratory testing on soil, rock and water, are also used to provide parameters for the design and construction.

Key words: Karst Terrain, Deeply Embedded Tunnel, Geotechnical Investigation