Guide channel construction for gas drainage and its applications in coal seams with low permeability and strong burst-pronenees
Abstract：A gas drainage program was built based on the gas control requirements of coal seams with low permeability and strong outburst-proneness in Luling Coal Mine. The practices include surface well drainage to be used to reduce the risk of gas outburst, mining of a protective coal seam which eliminates the outburst-proneness of the protected area and cross-measure borehole drainage aimed to eliminate the hazard of gas outburst of the border area. The characteris- tics and effects of the corresponding guide channel were proposed as well. The experiments show that the sand layer is the guiding-channel in surface well drainage which could get a gas quality of more than 1 500 m3/d. The separation cracks offeres as the channels in protective seam exploitation increases the permeability by 1 930 times. The connected cracks between boreholes in underground drainage can be regarded as the diversion channels that improves the gas drainage by 4 times, and the permeability of coal seams by over 200 times
Keywords：coal and gas outburstgas drainageguide channelpermeability improvement
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：5( 1456-1460 )