Abstract: Based on the in situ observation and numerical simulation， the deformation characteristics of the retaining structure of a deep excavation and the existing building were investigated. According to the in situ observations and available literatures， parametric studies were conducted using FEM to investigate the deformational behaviors of the excavation adjacent to existing building. The relationships between the deformation of the retaining structures and the settlement of the adjacent building under various construction conditions were fully revealed. Results showed that the tieback anchored pile wall has a good deformation control capacity and can be applied effectively in Jinzhou area. The corner effect of the rectangular excavation is significant with a plain strain ration (PSR)of about 0.4~0.6.The linear relationship between the average building settlement (δ_va) and the maximum horizontal deformation of the retaining structure (δ_hm) is slightly influenced by the existing foundation depth and the excavation depth. The discreteness of δ_va and δ_hm appears when the distance between the building and the retaining structure (L) changes， however the δ_va/δ_hm decreases gradually with the increase of L.

Key words: tieback anchored pile wall, deformation characteristics, building settlement, numerical simulation, deep excavation