Experimental Research on the Mechanical Characteristics and the Failure Mechanism of Coal-Rock Composite under Uniaxial Load

Table 4

Distribution statistics of broken pieces after combined sample failure.

Sample number	Size (mm)							Total quality (g)	Fractal dimension	Average value	Damage form
	0∼2.5	2.5∼5	5∼10	10.0∼15	15.0∼20	20.0∼25	25.0∼30
C-1	7.41	3.32	4.99	6.36	8.22	20.33	0.00	50.62	2.36	2.35
C-2	6.91	5.94	11.47	8.76	13.46	0.00	0.00	46.54	2.31
C-3	7.02	2.56	6.79	5.31	10.21	0.00	22.25	54.14	2.39
D-1	11.08	8.41	6.36	12.48	15.61	28.38	0.00	82.32	2.25	2.28
D-2	9.85	5.22	8.76	10.53	16.54	27.55	0.00	78.45	2.29
D-3	11.46	6.12	11.93	11.22	14.58	0.00	23.84	79.15	2.31
E-1	14.83	6.90	13.38	9.54	10.26	18.32	36.51	109.74	2.18	2.17
E-2	9.05	5.79	6.93	8.74	11.61.	0.00	54.96	97.08	2.23
E-3	7.04	11.28	10.53	7.57	4.36	19.01	29.66	90.45	2.11