Table 4 Ratio table of firmness coefficient, adsorption and desorption index of similar materials.

From: Experimental study on the ratio model of similar materials in the simulation test of coal and gas outburst

Experiment No

Firmness coefficient

Experiment No

Adsorption desorption index

Pulverized coal ratio

Sodium humate content (%)

River sand (%)

Pulverized coal ratio

Sodium humate content (%)

River sand (%)

1

0.2

0.5

4

6

0.4

4

0.5

2

0.4

0.5

4

7

0.4

4

2.5

3

0.6

0.5

4

8

0.4

4

4.5

4

0.8

0.5

4

9

0.4

4

6.5

5

–

–

–

10

0.4

4

8.5

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