Analysis on Deformation and Stress Characteristics of a Multibraced Pit-in-Pit Excavation in a Subway Transfer Station

Table 2

Materials and dimensions for each layer of support in all directions.

Section	Prop level included	Material	Cross section
A-A	Prop 1−3	Reinforced concrete	Horizontal props: 0.8 m wide × 1.0 m high
			Diagonal props: 0.8 m wide × 0.8 m high
	Prop 4-5	Steel	Intensive props: 609 mm external diameter and 16 mm thick
B-B	Prop 1−3	Reinforced concrete	Main props: 0.8 m wide × 0.8 m high
			Connecting props: 0.6 m wide × 0.6 m high
	Prop 4	Reinforced concrete	0.8 m wide × 1.0 m high
The other two directions	Prop 1−3	Reinforced concrete	Main props: 0.8 m wide × 0.8 m high
			Connecting props: 0.6 m wide × 0.6 m high