A Multiscale Structural Analysis of Soft and Hard Coal Deposits in Deep High-Gas Coal Seams

Table 2

Determination of particle size distributions of the soft coal.

No. 4 soft coal		No. 13 soft coal
Range of particle size (mm)	Mass percentage (%)	Range of particle size (mm)	Mass percentage (%)
＞50	0.00	＞50	0.00
25–50	9.59	25–50	1.85
13–25	15.30	13–25	11.88
6–13	24.09	6–13	23.15
3–6	21.93	3–6	24.16
2–3	4.39	2–3	5.32
1–2	10.90	1–2	12.10
0.5–1	7.49	0.5–1	10.82
0.25–0.5	3.73	0.25–0.5	7.32
0.125–0.25	2.38	0.125–0.25	2.74
0.075–0.125	0.20	0.075–0.125	0.69