Experimental Research on Sensibility of Coal Samples Permeability Under Confining Pressure
WEI Jianping
LI Mingzhu
WANG Dengke
QIN Hengjie
Abstract：According to the complex loaded status of the coal in front of working face and heading face,the paper used a self-developed loaded coal or rock gas seepage experimental system,studyed the variation characteristics of permeability of coal with different moisture contents in the processes of repeated loading-unloading confining pressure.The results showed that both dimensionless permeability and damage coefficient of permeability decreased with the increase of confining pressure,and the decreasing amplitude tending to be gentle gradually.Stress sensitivity in the first process of loading was more obvious than the second process.As moisture content increased,stress sensitive coefficient increased.The variation of permeability was incomplete reversible in the process of loading-unloading confining pressure.The damage of permeability was very big in the first process of loading-unloading.It also increased with the increase of moisture content the damage of permeability was small in the second process of loading-unloading.The research results could not only provide experimental basis for further understanding coal seam gas migration law,but also provide theoretical support for gas drainage and prevention and control of gas disasters in coal mines.
Keywords：permeabilitymoisture contentstress sensitivityloading-unloading confining pressure
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 76-80 )