Advances in Civil Engineering / 2020 / Article / Tab 3

Research Article

A Study of the Laws of Abnormal Gas Emissions and the Stability Controls for Coal Mine Walls in Deeply Buried High-Gas Coal Seams

Table 3

Influence effects of the coal pore distributions on the gas adsorption and diffusion.

Coal samplesMicroporesSmall poresPeak points of the specific surface areas and pore volumes increment (nm)Influence effects on the gas of the hole distributions

Hard coal of the No. 6 coal seamDeveloped
3–70 nm
Developed
100–300 nm
4Conducive to gas adsorption and diffusion

Soft coal of the No. 6 coal seamDeveloped
2–100 nm
Developed
100–250 nm
2Conducive to gas adsorption and diffusion

Hard coal of the No. 8 coal seamRelatively developedRelatively developed
100–240 nm
3.5Conducive to gas adsorption and diffusion

Soft coal of the No. 8 coal seam2–4 nm
30–70 nm
Relatively developed
2–8 nm
15–100 nm
Relatively developed
100–240 nm
3.5Conducive to gas adsorption and diffusion

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