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

Table 1

Mechanical parameters of the artificial layered rock mass.

(GPa)	(GPa)	(GPa)			(°)	(MPa)	(MPa)	(°)	(°)	(°)	(MPa)	(°)	(°)	(MPa)
5.26	4.58	1.96	0.21	0.23	10	2.4	20	45	60	0	11	18	6	0.5

Note: and denote the elastic moduli in the directions parallel and normal to the bedding plane, respectively; denotes the shear modulus in the direction normal to the bedding plane, which is calculated based on the empirical equation [12]; and denote the Poisson ratios in the directions parallel and normal to the bedding plane, respectively; and denote the dilation angles of the interlayered rock and the bedding plane, respectively.