Fuzzy comprehensive evaluation method of spontaneous combustion risk of coal in goaf and its application

According to the coal spontaneous combustion factors and spontaneous combustion prevention factors in goaf,an evaluating index system is established for the risk of coal spontaneous combustion in goaf.The first grade indicator is self-ignition orientation of coal,geological occurrence conditions of coal bed,mining factors,ventilation factors and spontaneous combustion control factors.By adopting fuzzy comprehensive evaluation method,the index weight and membership function were determined and the fuzzy comprehensive evaluation model was established.In the end taking the 1122(3) working-face of Guqiao coal mine as an example by adopting this method,the evaluation results are basically consistent with the actual.This showed that the evaluation method for making effective goaf spontaneous combustion fire prevention measures has guiding significance.