Abstract: Nowadays, there are more and more large-scale deep excavation projects in cities, and it is particularly important to monitor and analyze the data of the deep excavation and to study the deformation. Based on an example of a large-scale deep excavation project in Suzhou, the accumulated vertical and horizontal deflections at the pile top and the accumulated settlement of the surrounding ground surface during the excavation process were monitored. The monitored data were compared with the numerical analysis results by using software ABAQUS. The results show that the feasibility of the different excavation supporting methods, such as, three-axis mixed soil-cement column inserted by the PHC pipe piles, bored cast-in-place reinforced concrete piles, inclined jet grouted ground anchors, steel pipe rakers, reinforced concrete strut combined with soil nail wall with shotcretes. The displacement at the pile top of the supporting structure, the groundwater level variation outside the excavated area, the surrounding pipelines, and the actual measured values of the settlement of the building are all less than permitted values. The results of the ABAQUS numerical analysis show that the cumulative vertical displacement value at the pile top is consistent with the actual monitored data.

Key words: Large-Scale Deep Excavation, Construction Monitoring, Numerical Analysis