Study Of The Fully-mechanized Sublevel Caving Coal Combustion Three Zones Of Chen-jiagou Coal Mine

Coal is among the most important emergy resources around the world, but coal is stillone of important hidden trouble in the safety of coal mine fire. Because of large strength offully mechanized mining areas, high taking down space, more coal in one-time off, rathermining air volume in workface, plus it’s hard to manage ventilation in workface, all this makemore float mine left in coal gob easily, which cause left coal combustion in gob.3103fully mechanized coal workface using Tilting layered trend long wall fullymechanized low caving coal method in Chen Jia-gou coal in Hua Ting, using all the fullcollapse to management the roof, layer thickness is10m, machine adopt thickness is3m,thickness of top coal caving is7m, caving ratio is1:2.3. The mining workface usingpiecewise interval several rounds of order put coal, two mining a put, cutting depth is0.6m,circulation steps is1.2m.This paper uses the spot observation, experimental study and numerical simulationmethod to research mine spontaneous combustion dangerous area in Chen jia-gou3103fullymechanized gob. First, use of large coal spontaneous combustion equipment and procedureswarming experiments to test the coal spontaneous combustion characteristic parameters, andknow the shortest coal spontaneous combustion time is32days; Second, through siteobservation and production status determinate float coal thickness, Double Crossheading andtwo end scaffold float coal thickness is8.75m, central workface floating coal thickness is1.88m; And then, through the theoretical analysis obtain porosity and permeabilitydistribution, combined with actual situation date in workface, establish a mathematical andphysical model, and simplify the boundary conditions reasonably, then applicate ANSYSFLUENT software to simulate mine workface gob, then get the oxygen concentration and pressure distribution; Finally, based on the experimental data, the field observation andnumerical simulation analysis, conclude gob coal combustion "three zones" and the lowestsafety advancing speed of Chen Jia-gou mine3103fully-mechanized.