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

Table 2

Cross passage support parameters.

Item		Main materials and specifications	Structure size
Support	Big pipe shed	Φ1086	Length: 10 m; ring spacing: 0.5 m
	Leading conduit	Φ423.5, length = 2 m and 3.5 m, steel bar	Ring spacing 0.3 m
			Vertical clearance: 1.5 m
	Grid steel frame	C25, C14 steel bar	Vertical clearance: 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: 0.3 m
	Secondary lining	C35 waterproof reinforced concrete seepage resistance grade p10	Thickness: 0.6 m