Abstract
Directional hydraulic fracturing method (DHF method) for controlling hard roof in coal mines and the means of its implementation is given in the paper. The method allows getting extended, set in a given direction cracks for stratification and cutting off the roof and for providing their controlled caving in different technological schemes. Geo-physical methods are introduced, the monitoring and the mine site experimental testing data on controlling the roofs applying the method of extraction pillar seismic testing on transmitted waves are studied. The experience of applying the method at Kuzbass mines are analyzed.
Highlights
Nowadays the coal has partially restored its position as a global energy source material which it nearly lost in the first half of the twentieth century
The increasing scope of powered support application within the past years goes to the development of the hard roof coal seams
Directional hydraulic fracturing method was applied during mining the extraction pillar of 823 Face at “Lestvyazhnaya” Mine in Kuzbass
Summary
Nowadays the coal has partially restored its position as a global energy source material which it nearly lost in the first half of the twentieth century. The increase of horizontal stresses due to the main roof caving after the mining of the previous face brings about the outsqueezing of coal pillars into the workings.
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