Abstract: The geological conditions of the thick sand layer are characterized by the high permeability and sensitive to the deformation after unloading. The excavation support design aspects of a metro station in thick sand stratum was summarized by presenting a case history of the supporting structure for the first phase Station for Metro Line #3 in Wuxi City. The deformations of the supporting structures were compared with the construction monitoring data. The necessity of the steel walers, reliability of the steel strut and connection joints, distribution of vertical and horizontal supports, dewatering depth outside of the excavation area and the passive earth pressure inside the excavation area are evaluated. As major control measuring, the deformation a the supporting structures were verified and the results were satisfactory.

Key words: metro station, thick sand stratum, deep excavation, deformation