高瓦斯易自燃煤层采空区遗煤自燃影响因素研究

Research on factors influencing spontaneous combustion of coal in goaf in gassy coal seam having propensity to spontaneous combustion

为预防高瓦斯易自燃煤层采空区遗煤自燃事故,根据此类煤层采空区遗煤自燃的特性,共选取19个影响因素,采用基于直觉模糊集的集成决策实验室分析与解释结构模型（DEMATEL＆ISM）法对这些因素进行结构化处理,以此分析各因素对此类煤层采空区遗煤自燃的影响。结果表明：高瓦斯易自燃煤层采空区遗煤自燃的影响因素分为3个层次;工作面长度、通风方式、煤的吸氧速率、临界温度、残余瓦斯含量、煤层厚度、倾角与地质构造为根源因素;邻近层瓦斯情况、工作面开采方法、通风风量、推进速度为中间因素;防灭火措施、安全监测、采空区遗煤厚度、瓦斯抽采措施、工作面通风阻力、推进速度、围岩温度、煤层埋藏深度与顶板岩性为表层因素。

In order to prevent the spotaneous combustion accident of coal in goaf in gassy and high spontaneous combustion propensity coal seam,19 influencing factors were identified according to the characteristics of goaf spontaneous combustion in this kind of coal seam. The factors were treated by using the integrated DEMATEL and ISM method based on intuitionistic fuzzy sets. A multi-level hierarchical structure model was built for the factors and the respective influences of the factors were examined. The results show that the factors influencing goaf spontaneous combustion in gassy and high spontaneous combustion propensity coal seam can be divided into three levels： the root factors are the ventilation mode,the length of working surface,the oxygen absorption rate,the critical temperature,the residual gas content,the thickness of coal seam,the dip angle and geological structure of coal seam. Intermediate factors are the gas condition in adjacent layer,the mining method of working surface. The air quantity of ventilation and advancing speed of working surface. The surface factors are the fire prevention measures,the safety monitoring,the goaf residual coal thickness,the gas extraction measures,the ventilation resistance of working surface,the advancing speed,the surrounding rock temperature,the depth of coal seam and the roof lithology,and that more attention should be paid to improving the root factors.