Evolution Rules of Fractures for Mudstone under Compression Shear Load and the Fractal Characteristics of Broken Blocks

Table 1

Test results for shear strength of mudstone samples.

Sample no.	Shear angle (°)	Sample size (mm)	Failure load (kN)	Normal stress σ (MPa)	Shear stress τ (MPa)
1#	40	ϕ 67.26 × 70.90	64.44	10.35	8.69
2#		ϕ 67.26 × 69.98	61.34	9.98	8.38
3#		ϕ 67.26 × 71.42	68.96	11.00	9.23
1#	45	ϕ 67.36 × 71.58	59.94	8.79	8.79
2#		ϕ 67.26 × 69.50	51.87	7.85	7.85
3#		ϕ 67.16 × 69.66	55.02	8.32	8.32
1#	50	ϕ 67.00 × 70.00	49.92	6.84	8.15
2#		ϕ 67.16 × 70.20	44.40	6.05	7.21
3#		ϕ 67.26 × 69.06	40.32	5.58	6.65
1#	55	ϕ 67.16 × 68.88	34.66	4.30	6.14
2#		ϕ 67.40 × 72.06	36.68	4.33	6.19
3#		ϕ 67.26 × 72.86	40.52	4.74	6.77