Optimal Analysis of Tunnel Construction Methods through Cross Passage from Subway Shaft

Table 1

Shaft support parameters.

Item		Main materials and specifications	Structure size
Support	Leading conduit	Φ423.5, length = 2 m and 3.5 m, steel flower tube	Spacing: 1.01.0 m and 1.51.5 m
	Grid steel frame	C25, C14 steel	Vertical clearance: 0.75 and 0. 5 m
	Mesh reinforcement	Φ8 150150 m grid	Surrounded by laying, double
	Vertical reinforcement	C22 steel bar	Ring spacing: 1.0 m, double
	Shotcrete	C25 early strength concrete	Thickness: 0.4 m