Application of Constant Resistance and Large Deformation Anchor Cable in Soft Rock Highway Tunnel

Table 1

Rock properties and rock mass properties.

Lithology	Rock		GSI	Constant				Rock mass
	(MPa)	Ei (GPa)		mi	mb	S	a	σcmass (MPa)	Erm (GPa)
Natural state carbonaceous slate	29.5	7.6	40	19	1.091	0.000335	0.511	7.4	0.6