Disaster and evolvement law of mining-induced stress under extremely thick igneous rock
Abstract：To find out the reason why coal and gas outburst（CGO） occurred in the Ⅱ102 mining area,the geological and mining conditions,gas geology and outburst characteristics were analyzed.A numerical model with universal distinct element code was built to study the evolvement law of mining-induced stress（MIS） under 140-m-thick extremely thick igneous rock（ETIR） with the purpose of explaining the occurrence of the disaster in the viewpoint of MIS coverage.The results indicate that the ETIR which is 170 m above the coal seam doesn＇t break in the span of 370 m,and the coverage of MIS increases to 310 m which is three times of that without ETIR.The factor of MIS increases to 1.7 in the roadway 180 m away from the goaf,which proves that MIS is the main power for the CGO when excavating in the roadway of Ⅱ1026 working face under ETIR.
Keywords：extremely thick igneous rockmining-induced stressevolvement lawcoal and gas outburst
Publication Date：2011-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)