Methane sorption and seepage in coal and characteristics of acoustic emission
Abstract：Acoustic emission signals generated in process of methane sorption and seepage in coal were observed,and the dynamic characteristic of damage evolution and the seepage process were analyzed based on the characteristic of acoustic emission.The experiments indicated that the strength of acoustic emission decreased with the adsorbed methane increase.And the acoustic emission showed paroxysmal in time domain.The results give implication that the methane seepage in coal layer by layer.In its seepage process,methane shows destructive seepage while the gas pressure gradient was bigger than the threshold value.Then,pressure of the seepage face decreased and the methane shows undestructive seepage.Sorption process tends to equilibrium with the gas pressure increase.
Keywords：sorption and seepageacoustic emissionparoxysmaldamage evolutionseepage by layer
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 641-646 )