Abstract: Some damages such as overall incline, horizontal misalignment in the movement joint, spalling of sealant and liner in the movement joint etc. of a metro station passageway have been found, which caused by excavation of adjacent deep foundation. In order to provide guidance for the metro security, the passageway accidents and damage cases have been described as follows: the project’s overview of the accident case is introduced including the design and engineering geology of the passageway and deep foundation; the main damage of the passageway is summarized detailedly; the main cause for the passageway’s damage is discussed based on circumstances surrounding, the passageway construction site, actual displacement data, pit monitoring data. Numerical simulations are carried out for the underground diaphragm wall and excavation construction of the foundation pit, prestressed anchorages are disturbed by the underground diaphragm wall construction and the computed passageway’s displacement is induced by drawdown. Finally, from the perspective of metro protections, the successful experience and accident protection lessons are summarized.

Key words: metro protection, foundation pit, passageway structure, damage, induced causes