A Novel Closed-Form Solution for Circular Openings in Generalized Hoek-Brown Media

Table 1

Basic properties of rock mass used for numerical tests.

Rock example	A	B	C	D	E
Quality of rock mass	Very good	Average	Very poor	Very poor	Very poor
(MPa)	150	80	20	30	5
(MPa)	150	80	20	25	5
(GPa)	42	9	1.4	5.7	0.224
(GPa)	10	5	1.4	5.7	0.224
	0.2	0.25	0.3	0.3	0.3
	0.5	0.51	0.52	0.55	0.585
	10.2	2.01	0.657	1.7	0.402
	0.062	0.0039	0.0004	0.0039
	0.51	0.53	0.52	0.6	0.585
	1.27	0.34	0.657	0.85	0.402
	0.0002	0	0.0004	0.0019
	1.5	1.15	1	1	1
	4.3	2.02	1.51	1.98	1.39