Research on Surface Subsidence of Long-Span Underground Tunnel

Table 3

Main construction methods of underground excavation station of Subway Line 3.

Number	Site name	Arch main surrounding rock grade	Construction methods
1	Wannianquan Road Station	IV～V	Open excavation method, CRD method, CD method, double-wall guide pit method, and step method
2	Junfeng Road Station	IV～V	Open excavation method, CRD method, CD method, double-wall guide pit method, and step method