Abstract：In order to determine sensitivities of influencing factors on the height of water flowing fractured zone under subcritical mining, a weighted grey relational analysis model was proposed based on grey relational analysis and analytic hierarchy process. Firstly, the influencing factors of the height of water flowing fractured zone under subcritical mining were analyzed and determined. Then the relational degrees of influencing factors were determined by grey relational analysis, and the weights were determined by analytic hierarchy process. Finally, the sensitivities of influencing factors were determined based on values of weighted relational degrees. The results showed that the sensitivities of the influencing factors from big to small were inclined length of coal face, mining thickness, overburden structure characteristics, mining depth, and dip angle of coal seam. Therefore, the influence of inclined length of coal face on the height of water flowing fractured zone must be considered in subcritical coal face.

Keyword：subcritical mining;water flowing fractured zone;sensitivity analysis;analytic hierarchy process;grey relational analysis;