Characteristics of Bituminous Coal Permeability Response to the Pore Pressure and Effective Shear Stress in the Huaibei Coalfield in China

Table 2

The proximate analyses of sampling coal seam [29].

Coal samples	Mad (%)		Aad (%)	S.d (%)	P.d (%)	Vdaf (%)
SA3	1.51		18.85	0.68	0.0089	35.39
SA8	1.41		17.88	0.53	0.0112	31.93

Note: Mad: moisture content; Aad: ash content; S.d: sulfur content; P.d: phosphorus content; Vdaf: volatile matter, ad: air dried condition, daf: dry ash free condition.