Abstract: Based on the analysis of the factors influencing the height of water flowing fractured zone of roof, mining thickness, mining depth, and working face length, compressive strength of rock and characteristics of rock assemblages have been studied and the corresponding influence indexes have been quantified. Then the weight of the factors has been studied through the analytic hierarchy process and the height of fractured zone has been clustered by the fuzzy clustering analysis method. The result of the study of 10 working face data shows that the mining height is just one of the main factors influencing the height of water flowing fractured zone, with several other factors having an effect on it as well. The research results basically equal the empirical values and measured values. So it is a reasonable study method through which the height of water flowing fractured zone of coal seam roof can be predicted for coal mine.

Key words: water flowing fractured zone, analytic hierarchy process, weight, fuzzy clustering analysis