Abstract: The stability of the deep excavation for the community service center of Guangzhou Wushan Avenue is comprehensively evaluated by using Gray Relation Analysis (GRA) method. The deep excavation is supported by anchored tangent pile walls. The entire excavation supporting system is divided into several sub units so that the representative factors that might impact the stability of the excavation can be evaluated. These seven (7) factors are: internal supporting type, stiffness of the supporting system, surcharge near the excavation (asymmetric loading condition), width of the berm in front of the excavation, time lapse between the excavation and internal bracing, amount over excavation, anchor installation quality. The comprehensive evaluation value numbers recommended from the back analysis of the case history of the deep excavation failures as well as the insitu monitoring data are used as the reference of the evaluation. This deep excavation site can be quantitatively classified into [JP2]three safety categories based on the GRA approach. The GRA approach provides a useful tool for the prediction of the excavation.

Key words: Gray Correlations, Deep Excavation Safety Evaluation, Comprehensive Evaluation