Abstract: With the urban development, the deep excavations in the densely populated urban areas are increasingly common and ensuring the safety of surrounding buildings in the deep excavation process has become an important premise of engineering projects. Because of this, the large deep excavation project needs more strictive requirements for the construction control in the complex environment. The Hefei North First-Ring Underground Station is a four-floor structure with complicated adjacent building environment, and the safety level is classified as Level I. Considering that there are many buildings around it, the corresponding construction control measures are proposed in this paper. The foundation pit was excavated by layers, in a segmental and balanced way. The excavated areas are supported by the diaphragm wall with five layers of internal struts. The entire excavation process was performed in the strict construction considerations. The monitoring results showed that the tilting rate and the settlement of the buildings which were in the safe and stable state and all of them didn’t exceed the tolerance values. The surrounding buildings were well protected by the corresponding construction measures.

Key words: Large Deep Excavations, Surrounding Buildings, Settlement, Control Measures