Abstract: This paper presents a case history of the excavation techniques of a shallow buried metro tunnel under passing the existing building. Based on the geological condition prediction and the test boring information, the tunnel excavation utilizes the deep hole grouting at the excavated face and sleevevalvepipe grouting at the ground surface. Both the excavated dimension and the vibration peak particle velocity from the blasting are strictly controlled. In addition, the deformations at different locations, such as, ground surface, crest of the excavated tunnel, as well as the net clearance within the tunnel, are monitored during the excavation. The results indicate that the deformations are well under the permissible values.

Key words: Geological Predictions, Advanced Grouting, Blasting, Monitoring