An Index for Estimating the Stability of the Layered Rock Masses under Excavation Disturbance

Table 3

Mechanical parameters of the surrounding rock mass and backfilled concrete.

	(GPa)	(GPa)	(GPa)			(°)	(MPa)	(MPa)	(°)	(MPa)	(°)	(°)	(°)	(°)	(MPa)
Surrounding rock mass	2.4	1.8	0.75	0.30	0.33	10	1.0	2.0	45	0.1	30	75	60	6	0.2
Backfilled concrete	30	30	12	0.25	0.25	10	2.0	2.2	45	2.2	45	75	0	10	2.0