Study on the Large Deformation Characteristics and Disaster Mechanism of a Thin-Layer Soft-Rock Tunnel

Table 6

Strength of the carbonaceous slate rock mass.

Lithology	Rock		GSI	Constant				Rock mass
	(MPa)	(GPa)						(MPa)	(GPa)
Carbonaceous slate in the natural state	29.5	7.6	40	19	1.091	0.000335	0.511	7.4	0.6
Carbonaceous slate in the saturated state	11.7	2.8	37	5	0.249	0.000225	0.514	3.0	0.1

Note. : rock mass modulus; : uniaxial compressive strength of the rock mass; : deformation modulus of the intact rock; : uniaxial compressive strength of the intact rock.