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- W2374851439 abstract "In order to solve the gas control problem of the coal mining faces in No.8 Mine of Pingdingshan Coal Mining Group and according to the distribution theory of the roof caving zone in the coal mining face,with a large power hydraulic powered drilling rig and the rational borehole drilling parameter design,oblique crossed borehole drillings for gas drainage were operated in the roof of the coal mining face.After the application of the oblique crossed boreholes for the continued gas drainage,the gas volume fraction at the top corner was reduced by 0.15%~0.2%.During the coal production period,a power-off phenomenon was obviously reduced and there was no gas over limits occurred." @default.
- W2374851439 created "2016-06-24" @default.
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- W2374851439 date "2009-01-01" @default.
- W2374851439 modified "2023-09-26" @default.
- W2374851439 title "Research and Implementation on Oblique Crossed Boreholes in Air Return Gateway of Coal Mining Face" @default.
- W2374851439 hasPublicationYear "2009" @default.
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