Abstract: The excavation of foundations that are directly above an operational metro subway could be challenge. The design and construction of the supporting system are critical to the control of subway deformations. This paper presents a case history of the excavation above a live subway in Chengdu City. Prior to the excavation, the protective measures were installed on the metro subway. The strut supported anchored soldier piles were used for the excavation support. And the dewater technique was used for the layered excavation. The construction monitoring data indicate that, in addition to the excavation support measures, the subway protective work also helped to reduce the subway deformation and the measured deformations are acceptable.

Key words: Metro Subway, Deep Excavations, Foundation Constructions, Displacement Control