Experimental And Numerical Simulation Study On Coal And Gas Outburst In Deep Mine Based On Different Depth

Coal and gas outburst, which is that under pressure, the fragment coal and gassuddenly vomits from coal mass to the mining space, is a kind of extremely complexdynamical phenomenan of engineering geological hazard. The stress, gas pressure andtempressure of deep stope increases gradually as mining depth increased that it is to belarge differences from the shallow coal seam of mechanical characteristics.Therefore,Research on experiment simulation and numerical calculation of coal and gas outburst,has theoretical and practical significance to the prevention of coal and gas outburstdisasters for deep stope and safety production in coal mine.This paper selects the coal sample of the upper layer of Sunjiawan mine in Fuxin ofLiaoning province as the research object.we do research on the initiative outburstsimulation experiment using simulation device on coal and gas outburst which aredeveloped and set up by ourselves. The experiment Simulate outburst process in thedepth of900m,1100m,1300m; Simulate the effect of ground stress by axial pressure andconfining pressure; Simulate the effect of gas stress by pore pressure.we calculate thenumerical value of axial pressure、confining pressure in the three mining depth by meansof similarity theory.got numerical value of critical gas pressure、outburst strength andoutburst distance by pore pressure’s increasing gradually. The experiment havereproduced the phenomenan of gas outburst cavern with a small mouth and a big cavity,sorting of outburst Coal power.Result shows the reliability of the experimental device.Based on the test results, we mainly analyzes the laws of coal particle size distribution,mass distribution and sorting of outburst and the results are in agreement with previousachievements.Then by means of the inversion of field outstanding effective stress valuesbased on the experimental results, energy of coal and gas outburst of the theoreticalderivation, basically consistent with the measured values. Finally, a numerical modelwas established by THM coupling,and simulated the regulation change of the coal seamgas pressure, the velocity of seepage of gas, effective stress, volumetric strain, porosityand permeability. The conclusion of the study can provide reference for the preventionand control of coal and gas outburst of the mine.