Research on the Extraction Technology of Gas-Integrated Working-Face in Close Coal Seam Mining in Permafrost Area

Table 2

Pore distribution characteristics.

Coal seam	Micropore		Pinhole		Mesopore		Macropore			/%
	/(mL/g)	/%	/(mL/g)	/%	/(mL/g)	/%	/(mL/g)	/%
3#	0.0165	56.51	0.0079	27.06	0.0014	4.79	0.0034	11.64	3.756	3.55
4#	0.0259	43.55	0.0136	22.76	0.0095	15.90	0.0103	17.27	3.893	2.68
5#	0.0227	45.04	0.0123	24.53	0.0091	17.97	0.0069	11.61	2.455	3.53

Note: : pore volume per unit mass, : specific pore volume, : specific surface area.