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

Table 3

Comparison of results for an average good quality rock mass (Example B).

Plastic behaviour	(MPa)	(MPa)		/ (%)			Error (%)
				Exact	Sharan [7]	This work	Sharan [7]	This work
Perfectly plastic	20	0	1.00	0.44	0.44	0.44	0.0	0.0
	20	0	1.15	0.45	0.45	0.45	0.3	0.0
	20	0	2.02	0.55	0.57	0.55	2.9	0.0
	40	0	1.00	1.34	1.34	1.34	0.0	0.0
	40	0	1.15	1.43	1.44	1.42	0.9	−0.7
	40	0	2.02	2.08	2.24	2.06	7.9	−1.0
	80	0	1.00	5.05	5.05	5.05	0.0	0.0
	80	0	1.15	5.64	5.76	5.63	2.0	−0.2
	80	1	1.15	4.32	4.39	4.31	1.7	−0.2
	80	0	2.02	10.8	12.6	10.7	16.7	−0.9
	80	5	2.02	4.03	4.41	4	9.4	−0.7
Brittle plastic	20	0	1.00	2.96	2.96	2.96	0.0	0.0
	20	0	1.15	3.44	3.48	3.43	1.2	−0.3
	20	0	2.02	8.08	8.77	8.05	8.6	−0.4
	20	1	2.02	1.73	1.79	1.72	3.5	−0.6
	40	0	1.00	20.3	20.3	20.3	0.0	0.0
	40	3	1.00	3.7	3.7	3.7	0.0	0.0
	40	0	1.15	25.8	26.3	25.7	2.2	−0.4
	40	3	1.15	4.19	4.24	4.19	1.0	0.0
	40	0	2.02				14.2	−0.8
	40	5	2.02	4.34	4.56	4.32	5.0	−0.5
	80	0	1.00				0.0	0.0
	80	18	1.00	4.99	4.99	4.99	0.0	0.0
	80	0	1.15				3.0	0.0
	80	20	1.15	4.44	4.48	4.44	0.7	0.0
	80	0	2.02				18.6	−0.6
	80	24	2.02	4.49	4.65	4.47	3.4	−0.4