Experimental Study on Structural Form and Excavation Model of Urban Metro Cross Transfer Station with Super Large Cross Section and Shallow Excavation

Table 1

Parameters of the material.

No.	Materials	ρ (kg·m^−3)	E (GPa)	μ	c (MPa)	θ (°)
1	Surrounding rock	2,500	2.45	0.34	1.2	34.78
2	Anchorage	2,500	2.45	0.30	1.35	34.78
3	Primary support	2,200	23	0.32	—	—
4	Second lining	2,200	23	0.22	—	—