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 samples	Micropores	Small pores	Peak 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 seam	Developed; 3–70 nm	Developed; 100–300 nm	4	Conducive to gas adsorption and diffusion
Soft coal of the No. 6 coal seam	Developed; 2–100 nm	Developed; 100–250 nm	2	Conducive to gas adsorption and diffusion
Hard coal of the No. 8 coal seam	Relatively developed	Relatively developed; 100–240 nm	3.5	Conducive to gas adsorption and diffusion
Soft coal of the No. 8 coal seam	2–4 nm; 30–70 nm; Relatively developed; 2–8 nm; 15–100 nm	Relatively developed; 100–240 nm	3.5	Conducive to gas adsorption and diffusion