Study On Gas-geology Law And Gas Forccaatingin Hexhuang Coal Mine

In recent years, with the lengthways development of mining depth on coal-bed ,thegeological condition is more and more complex, and the problem of mining gas is moreserious. The二1coal-bed is a primary coal-bed of Hezhuang coal mine, with its enlargementof mining depth, the range of gas content and coal and gas outburst is enlarger, whichseriously threatens insuring safety in mining. So the study on mine gas storage law and theanalysis of regional gas distribution geological factors, is the topic which in the present coalmine safety productive work urgent needs to solve.Firstly, in this paper, using geological evolution and tectonic gradual control theory,reach a conclusion:The Dengfeng coal field is by strong pushing of the Qinling fold beltuplift and converse swoop of the Kula-Pacific Ocean plate, and at basic of the original NorthWest, North West structure formed a series of North-North East, North East extrusion ruptureand folding structure, and bring about Dengfeng coal field complex structure, tectonic stressrelatively concentrated, where is the best areas of tectonic coal development and the dangerzone of coal and gas outburst.Secondly, from the angle of gas storage law, combining with the Hezhuang mineproduction field measurement statistics of the gas content, gas pressure data, and at basic ofanalyzing a good many factors which affect gas content,using statistics regression methodseparately built relativity of gas content with the characteristics of roof and floor rocks, burialdepth of coal-bed, the coal-bed's thickness. The result show that the burial depth of coal-bedis a main controlling factor, which controls general trend of gas content, the gas contentincreases with the increase of the burial depth of coal-bed. Use separate source forecastingmethod and grey system forecasting method forecast gas emission in unmining area, andcompare result of the two methods conclud that the two kinds of results is very similar. Lastly, according to the mechanism of coal and gas outburst and gas content predictionresults, and with content of gas pressure parameters, regional outburst dangerous forecast.Theresult show that: Elevation -6m of the coal seam floor deep areas which the gas content isrelatively large, basically above the 8 m3 / t, is forecast to outburst hazard zone.