Effect of construction of deep excavation in Hangzhou silty sand on adjacentmetro tunnels and stations

The researches on the settlement of soil, deformation of retaining wall and environmental impact of deep excavation of Metro Control Center during construction, which is 6~8 m away from the metro tunnel and station, are presented. A series of methods are taken, such as dewatering, water proofing and double-row retaining wall to ensure the safety of the metro tunnel and station. The construction is succeeded with the deformation of metro tunnel in the range of allowable values.