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

Table 2

Comparison of failure modes and shear strengths between the original samples and subsamples.

Discontinuity	Normal stress, σ (MPa)	Peak shear strength, τp (MPa)			Residual strength, τr (MPa)			τp-τr (MPa)		Failure mode
		➀	➁	➂	➀	➁	➂	➀	➁	➀	➁
A1	2.04 (10°)	7.47	6.27	16.1%	6.75	2.17	67.9%	0.72	4.10	Wear	Shear
A2	1.02 (10°)	14.56	14.32	1.6%	10.60	3.43	67.6%	3.96	10.89	Shear	Shear
A3	0.51 (0°)	9.24	8.20	11.3%	7.91	6.22	21.4%	1.33	1.98	Shear	Shear
A4	2.04 (10°)	14.57	13.39	8.1%	12.89	5.58	56.7%	1.68	7.81	Shear	Shear
A5	0.51 (10°)	6.38	6.12	4.1%	5.89	3.66	37.9%	0.49	2.46	Wear	Shear
A6	0.51 (30°)	9.88	9.64	2.4%	6.35	5.03	20.8%	3.53	4.61	Shear	Wear
A7	0.51 (0°)	8.52	7.04	17.4%	4.80	3.95	17.7%	3.72	3.09	Shear	Shear
A8	2.04 (0°)	10.41	8.73	16.1%	7.76	2.10	72.9%	2.65	6.63	Shear	Shear

Note: ➀ = original sample; ➁ = subsample; ➂ = change ratio.