Abstract:Increasing attention to urban environment safety due to urban tunnel excavation is focused in recent years. Therefore,it is significant to minimize the impact of tunnel construction on existing structures,facilities and especially some buildings. Compared with other structures,buildings are more sensitive to external effects because of particularity and complexity of structure;and their deformation mechanisms are more complicated,thus the accident consequences are more serious correspondingly. The 1st-stage Xiamen Airdrome project passes through a large number of buildings with shallow-buried large-span tunnel in complex geology strata,making the buildings protection crucial to assure environment safety and successful tunneling. Consequently,the mechanism and factors of tunneling-induced influence on buildings should be analyzed first,and then,after foundation and structure type,height and current damage condition,etc.,are classified,the safety evaluation of all the 63 buildings is then performed. Fuzzy-synthetic evaluation method is introduced in risk assessment and rating here. Nine key affecting factors of two general kinds are selected and the member function and weight of these factors are also determined. It is predicted that anticipated safety target of these buildings of different risk levels could be achieved with this specific guiding meaning.