Table 2 Regressional orthogonal experiment design.

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

Level

Pulverized coal ratio

Sodium humate content (%)

River sand content (%)

1

1:5

0.5

1

2

2:5

2.5

3

3

3:5

4.5

5

4

4:5

6.5

7

5

5:5

8.5

9

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