Experimental Study on 3D Roughness and Shear Failure Mechanism of Rock Mass Discontinuity

Table 1

Peak shear strengths of natural rough rock joint surfaces under different normal stresses and shear directions.

Number of discontinuity	Shear direction, θ (°)	Normal stress, σ (MPa)
		0.51	1.02	2.04
A1	0	2.18	3.19	5.45
	10	2.19	4.30	6.27
	20	8.60	12.99	16.00
	30	8.00	10.64	12.25
A2	0	10.71	12.84	14.30
	10	12.04	14.32	15.07
	20	10.41	12.31	15.21
	30	11.28	13.19	15.62
A3	0	6.28	8.20	10.32
	10	14.27	16.74	17.29
	20	8.06	12.56	17.30
	30	5.81	12.31	16.34
A4	0	12.68	14.89	16.26
	10	8.75	13.39	17.28
	20	6.02	9.03	14.11
	30	9.06	12.02	17.80
A5	0	2.06	4.26	7.50
	10	6.12	8.99	12.74
	20	3.67	6.81	9.00
	30	7.92	10.74	15.32
A6	0	11.38	12.69	15.24
	10	10.92	13.2	16.41
	20	9.82	11.94	13.79
	30	9.64	12.36	17.96
A7	0	7.04	10.85	12.02
	10	10.01	14.48	16.68
	20	11.75	14.39	16.66
	30	9.74	14.03	18.36
A8	0	5.12	7.04	8.73
	10	3.21	4.22	6.38
	20	3.05	4.15	5.52
	30	4.68	5.85	6.38