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

Table 2

Comparison of results for a very good quality rock mass (Example A).

Plastic behaviour	(MPa)	(MPa)		/ (%)			Error (%)
				Exact	Sharan [7]	This work	Sharan [7]	This work
Perfectly plastic	37.5	0	1.0	0.11	0.11	0.11	0.0	0.0
	37.5	0	1.5	0.11	0.11	0.11	0.0	0.0
	37.5	0	4.3	0.12	0.12	0.12	0.2	0.0
	75	0	1.0	0.25	0.25	0.25	0.0	0.0
	75	0	1.5	0.26	0.26	0.26	0.2	0.0
	75	0	4.3	0.32	0.33	0.32	2.4	0.0
	150	0	1.0	0.62	0.62	0.62	0.0	0.0
	150	0	1.5	0.68	0.69	0.68	0.8	0.0
	150	0	4.3	1.15	1.26	1.15	10	0.0
Brittle plastic	37.5	0	1.0	0.27	0.27	0.27	0.0	0.0
	37.5	0	1.5	0.31	0.31	0.31	0.4	0.0
	37.5	0	4.3	0.66	0.68	0.66	3.9	0.0
	75	0	1.0	1.09	1.09	1.09	0.0	0.0
	75	0	1.5	1.40	1.42	1.40	1.7	0.0
	75	0	4.3	5.01	5.69	4.98	13.7	−0.6
	150	0	1.0	5.30	5.30	5.30	0.0	0.0
	150	0	1.5	7.94	8.26	7.91	4.1	−0.4
	150	2	1.5	4.49	4.62	4.47	2.8	−0.4
	150	0	4.3			70.3	30	−0.8
	150	12	4.3	4.28	4.64	4.25	8.4	−0.7