Abstract: When the proposed shielded tunnel excavation is close to or underneath the existing or proposed building structures, the safety of these buildings is very important and shall be warranted. The reasonable design and excavation sequence are the effective aspects of ensuring the building structure safety. This paper presents a case history of safety evaluation of Wuhan Metro No. 11 Line shielded excavation on the proposed BMW and Mercedes vehicle service buildings. Two different approaches, the shortpiled raft foundations with pile tip above the shielded excavation zone and the long pile supported ground beams with pile tip below the shielded excavation zone are compared. The results indicate that the long pile supported ground beam approach is a better way ensuring the building safety.

Key words: Shielded Excavation, Building structures, Pile Supported Ground Beams