A New Method to Estimate the Joint Roughness Coefficient by Back Calculation of Shear Strength

Table 9

JRC^RL and JRC^RL values of 9 target joints.

Joint number	JRC^LR				JRC^RL				Mean of JRC^RL	Mean of JRC^RL	JRC in literature
	Normal stress				Normal stress
	5 MPa	6 MPa	7 MPa	8 MPa	5 MPa	6 MPa	7 MPa	8 MPa
1	11.13	11.25	11.84	10.63	16.42	16.39	16.37	14.68	11.21	15.96	14–16
2	19.67	20.59	19.42	17.27	13.83	14.05	14.01	12.09	19.24	13.49	18–20
3	30.25	29.56	30.75	25.63	18.27	16.77	15.96	13.24	29.04	16.06	14–16
4	9.38	9.14	9.47	8.59	5.13	5.83	5.17	4.92	9.15	5.26	10–12
5	17.94	18.13	19.14	17.04	13.89	14.20	14.68	13.02	18.06	13.95	6–8
6	9.27	9.50	9.27	8.04	1.26	0.95	1.04	1.51	9.02	1.19	10–12
7	0.81	0.77	0.73	0.59	0.56	0.56	0.66	0.72	0.72	0.62	4–6
8	1.04	1.07	1.20	1.42	0.38	0.49	0.59	0.52	1.18	0.49	2–4
9	0.47	0.56	0.66	0.44	0.19	0.25	0.35	0.27	0.53	0.27	2–4