矿业科学学报 (Oct 2016)
Research on influences on gas emission characteristic of coal seam caused by penetration partings
Abstract
Based on a self-developed coal seam gas emission test device, taking briquette samples containing penetration partings as the research object, and taking gas emission speed and gas cumulative emission amount of coal sample as study parameters, the influences caused by penetration partings on coal seam were studied systematically, and the mechanism of gas emission of coal seam with penetration partings was discussed.The results show that the gas emission speed of all briquette specimens presents power-function decay over time, and the cumulative emission amount presents an upper limit monotone increase over time.Both gas emission initial speed and cumulative emission amount of coal samples increase with the increase of adsorption equilibrium pressure.Under the same adsorption equilibrium pressure, the gas emission speed of specimens containing penetration partings is faster than the ordinary specimens in the initial stage, but two emission speed curves appear intersection from 30 min to 90 min, while the cumulative emission amount of specimens containing penetration partings is more than that of the ordinary specimens in the former 120 min.Penetration partings can improve the permeability of coal seam, provide migrations path for gas emission of coal seam, and create favorable conditions for the gas emission, so the gas emission efficiency is improved.
