Characterization of Coal Porosity for Naturally Tectonically Stressed Coals in Huaibei Coal Field, China

Table 2

DFT cumulative specific surface area, cumulative pore volume, and pore average width by N₂ isotherm for deformed coal samples.

Deformation series	Sample; ID	Deformation degrees	Specific; surface area/m^2·g^−1	Cumulative; pore volume/cm^3·g^−1	Average; width/nm
Brittle deformation	Y04	Weak	1.5815	5.5416	16.3869
	L10	Weak	1.1240	4.7415	16.2702
	L01	Weak	1.1800	6.3164	20.5245
	H12	Strong	2.5297	9.5317	11.9679
	T02	Strong	2.3491	9.0517	12.6179
	Z02	Weak	1.6465	5.1731	12.5544
Ductile deformation	L04	Weak	4.0009	10.943	7.87924
	K04	Weak	4.1434	12.183	7.79493
	H02	Strong	2.3708	9.2548	13.4231
	H09	Strong	2.6091	9.5586	12.1140
	H03	Strong	2.7430	11.574	15.2008
	T05	Strong	2.7171	10.050	12.0523