Study On Risk Of Spontaneous Combustion In Goaf Behind Mechanized Longwall With U-type Vetilation

Mine Fire is one of the mine a defense focused on the case of fire, will cause greater economic losses, may also cause other disasters. With the improvement of science and technology, although the number of fire accidents in recent years on a downward trend, angry the seam proportion higher view of the national spontaneous combustion, fire incidents have occurred, so the mine fire prevention has been the focus of the study of various experts and scholars.Based on the principle of fuzzy mathematics, according to the theory of Spontaneous, the establishment of coal spontaneous combustion index system, qualitative and quantitative analysis. An indicator of the evaluation index system of three, two18indicators. The establishment of the membership function using the method of four logical partitions, gob weight coefficient of each factor to establish the multi-objective decision-making level analysis, the logical partition key application of the law is to establish the threshold of each interval, the optimal threshold selection by scientific research has been made by most experts and scholars to accept the results. Two comprehensive fuzzy evaluation method to determine the evaluation of the collection, use the maximum membership degree principle to determine the evaluation level.Combined with xinji two coalmine of210610face of the geological conditions, the experimental data and numerical simulation results, the fuzzy evaluation model to evaluate the risk rating. The results of the evaluation can guide practice and the formulation of anti-fire measures.