This study analyzed how different factors affect the collapse of the upper part of a coal mine in Dafosi. They looked at things like how strong the coal is, how thick it is, and other geological aspects to see how difficult it is for the coal to cave in. Using a method called fuzzy Comprehensive Evaluation, they found that the top coal in this coal mine is really tough, making it hard for the coal to collapse easily. The collapse of the top coal in this mine is a big challenge because it's very hard.