Study on the Technology of Enhancing Permeability by Millisecond Blasting in Sanyuan Coal Mine

Table 5

Permeability coefficient calculation formula.

Traffic numeral Y	Basic standard time data F0 = λ	Coefficient at	Coefficient bt	Permeability coefficient of coal seam λ/m^2·(MPa^2·d)^−1	Constant	Constant
	10^−2∼1	1	−0.38
	1–10	1	−0.28
	10∼10^2	0.93	−0.20
	10^2∼10^3	0.588	−0.12
	10^3∼10^5	0.512	−0.10
	10^5∼10^7	0.344	−0.065