Research on Permeability Enhancement Model of Pressure Relief Roadway for Deep Coal Roadway Strip

Table 1

The permeability enhancement effect of coal seams with different .

Distance from the center of the roadway /m	Significant permeability enhancement zone /m	General permeability enhancement zone /m	Gas permeability increase multiple
7	4.3	12.1	11.1~239.3
9	3.5	15.4	6.7~89.2
12	1.2	20.5	3.6~37.1
15	0.3	20.7	2.4~9.1
18	0	20.5	1.2~5.5
21	0	20.4	0.8~1.6