Study On The Regional Prediction About The Outburst Of Coal And Gas In Nanshan Coal Mine

The outburst of coal and gas is one of important disasters in coal mine,prevention of outburstis thekey work in coal mine,howto forecastthe outburstisthe most basic work.Nanshan coal mineis located in Xifeng County of Guiyang City,regionalstructure is complex,there are many factors influencegas occurrence regularity,and has beenoccurredoutburst in Nanshan coal mine(includingdynamic phenomena),about 192 timesin the past.This paper studies the influencing factorsof thecoal and gas outburst in Nanshan coal mine,carried out theprediction outburst working of coal and gas.The specific contents are as follows:Firstly,from the influence ofgas occurrence regularity,the effect of geological structure、ground stress、coalmetamorphic degree、outburst forecastparameters ofcoal and gas outburstare studied respectively,and points out that thedifferent geological structuresaffect the occurrenceof coal gas,sealing structuresareconducive totheoccurrenceof gas;The greater the stress,the lower thepermeability of coal seamgas,moreeasy to save;The higher thedegree of metamorphismof coal seam,the poreisdeveloped,the greater thesaturated adsorptioncapacity,adsorption ability ofgasis stronger, theoriginal gas pressure is greater.Buried depth and geological structure is themain factors which influence thegas outburst of Nanshan coal mine,and must use the comprehensive index for outburst forecast.Secondly,Based on the geological data of Nanshan coal mine,research on thegas content、gas pressure、solidworkdeterminationcoefficient、gas diffusion initial speed、damage type etc...The adsorption constant of the west about the three mining area :a=28.030-28.777m3/t?r,b=0.900-1.070MPa-1,the gas pressure:Pmax=0.422 MPa,the gas content:Wmax=5.31m3/t, damage type: Ⅲ- Ⅳ,solidworkdeterminationcoefficient:fmin=0.4,gas diffusion initial speed:ΔPmax=29mm Hg.In the east of three mining areaelevationabove+1051.2m,the adsorption constant :a=26.987 ~ 31.627m3/t?r,b=0.660 ~ 0.724MPa-1,the gas pressure:Pmax=0.584 MPa,the gas content:Wmax= 5.34m3/t, damage type: Ⅲ ~Ⅳ,solidwork determination coefficient:fmin=0.3,gas diffusion initial speed:ΔPmax=14mm Hg.Finally,based on the above parameters,analyzed the minecausefactors of outburst of coal and gas.The prediction analysisof Nanshan coal mineareabysingle indexmethod andthe method of gas geology,the area above the level of +1145m and beyond the F7 fault 100m(by delineating the inflection point 6-A-B-C-D-E),coal seamis notinthe range of outburstarea.