| Gas is one of the main geological disaster of coal mine, conclude the regulation of coal seam gas occurrence of Daxing coal field and compile contour diagram of gas content through analyzing geological structure,coal-bearing sedimentary character, the lithology of coal seam roof and floor, the distribution regulation of magmatic rock and hydrogeology etc. these influential factors. On the basis of collation and comprehensive analysis of geological data of mining area gas, using artificial nerve network method,predict and evaluate the gas emission amount of un-mined area coal, carry out gas outburst hazard division on the Daxing mine field and compile contour diagram and gas outburst hazard division diagram. The main mining coal seam is 4-2 and 7-2 coal seam. The research show: the gas emission of 4-2 coal seam present increased tendency from north-east to north-west in all the field; the gas emission of 7-2 coal seam present increas tendency from north-east to north-west in the north-mid part of field, in the south present increase tendency. The gas emission of two coal layer varies greatly. The Daxing coal well is gas burst coal well, the most of coal field is gas outburst hazard zone, only a small part threat region locates in the south and north. |
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