Ningtiaota Mine Shallow Seam And Large Mining Height Fully Mechanized Face Gob Law Research

Modern mine in Northern Shanxi Ningtiaota mine is mine with an annual output of 10 million tons of coal, the shallow buried coal seam, affected by the mining, extremely easy to cause the surface subsidence, the formation of goaf surface leakage, once the occurrence of spontaneous combustion of coal, will pose a threat to the safety in production of coal mine,causing economic loss is very serious loss. Therefore, this thesis studies Ningtiaota Goaf Air Leakage regularity, the effective prevention of the Ningtiaota mine coal spontaneous combustion, played a very good role to escort.This thesis use theoretical analysis, numerical simulation and field experimental observation combining method, of Ningtiaota Coal Mine 2-2 coal seam fully mechanized working face mining surface air leakage regularity were studied. First the actual observed mining coal working face after the formation of the fracture characteristics, form leakage crack rules were determined using sulfur hexafluoride, by embedding distribution for the determination of gas concentration distribution. Analysis the air leakage law of the fractured surface. Mathematical model of air flow analysis, quantitative analysis of Inoue, seepage law;using CFD software FLUENT to develop air leakage law of numerical simulation study,further analysis on the goaf Air Leakage regularity, draw the conclusion of Ningtiaota shallow coal seam with large mining height fully mechanized working face goaf air leakage regularity and mines with similar conditions of other mining area in Northern Shanxi preventing goaf left coal spontaneous combustion, to ensure mine safety in production has certain reference significance.