Determining the Seepage Stability of Fractured Coal Rock in the Karst Collapse Pillar

Table 1

The mass ratio of the sample.

Particle sizes (mm)	Talbot index n
	0.1	0.2	0.3	0.4	0.5	0.6	0.7	0.8	0.9	1.0
0∼2.5	87.1	75.8	66.0	57.4	50.0	43.5	37.9	33.0	28.7	25.0
2.5∼5	6.2	11.3	15.3	18.4	20.7	22.5	23.7	24.4	24.9	25.0
5∼7.5	3.9	7.4	10.5	13.3	15.9	18.2	20.2	20.0	23.6	25.0
7.5∼10	2.8	5.5	8.2	10.9	13.4	15.8	18.2	22.6	22.8	25.0