灾变时井下大气的分形特征

FRACTAL CHARACTERISTICS OF MINE ATMOSPHERE DURING FIRE

利用分形理论研究灾变时矿井风流的变化规律，介绍了其分数维计算方法，得到了灾变时期井下大气各成分关联维数的动态曲线．研究发现：灾变初期各大气成分的分形维数变化趋势不同，火灾时期具有分形自相似性，火灾熄灭时出现明显的降维现象．根据这些信息可对火灾进行预测和预报，并判断灾害是否得到根治．

Using fractal theory,the change law of mine air during fire is investigated, the calculation method of fractal dimension is introduced,and dynamic curve of correlation dimension of each mine air composition on mine fire is given.The research showes that the change tendencies of fractal dimension at the beginning of fire are different, but all of them showes fractal selfsimilarity in the course of mine fire, and fractal dimensions decrease obviously when fire is quenched. Based on these information,mine fire can be predicted and determine whether mine fire is controlled.