Face Stability Analysis of Shield Tunnels in Homogeneous Soil Overlaid by Multilayered Cohesive-Frictional Soils

Table 1

Soil parameters of layers.

Sets’ number	Layers’ name		Layers’ number	(kPa)	(°)	(m)
1	Single crossed layer	Variable	(0)
					~
	Single cover layer	Constant	(1)
2	Single crossed layer	Constant	(0)
	Single cover layer	Variable	(1)
					~
3	Single crossed layer	Constant	(0)
	Two cover layers	Variable	(1)			= 0~9
			(2)