The classification of top coal cavability and its application in Lu’an coal mine

By using of dynamic fuzzy group method, the top coal cavability was evaluated according to the following seven factors, such as coal seam strength, mining depth, crack developing extent’s features, dirt band height, filling situation of goaf, classification of main roof and the ratio of mining and caving height etc. Based on these researches, the comprehensive evaluating model of top coal cavability by fuzzy mathematics theory was proposed and...