Abstract: Utilizing the real time monitored deep excavation data to optimize the support system design scheme and to guide the construction are widely discussed among practitioners. This paper presents the construction monitoring results of the deep excavation support of a vertical shaft for a shielded tunnel construction in Guangzhou. The groundwater variation, deformation of the supporting system, as well as the disturbance to the adjacent environments were monitored. The monitoring results indicated that the deformation in the original supporting system was very small and the optimization of the supporting system was investigated. Three dimensional numerical analysis was performed with the calibrated data. As a result of applying the monitored data guiding the consequence construction, one layer of the horizontal steel struts was eliminated.

Key words: Deep Excavation, In-Situ Monitoring, Design Optimization, Numerical Analysis, Informational Construction