Abstract：In order to mine I1 coal which was threaten by confined water, the water inrush factors of a main motherboard in Daping coal mine of Zhengzhou mining area were analyzed.The prediction partition of water inrush in the motherboard was divided by a single water inrush coefficient formula.However, the research on main water inrush factors indicated that it was incorrect to predict water inrush accident by the single water inrush coefficient formula.In this study, the water inrush partition in Daping coal mine was predicted by a fivefigure and double-coefficient method based on a water inrush coefficient method, and the main water inrush factors of Ordovician limestone water rich areas, mine pressure, large and medium-size fault, and minor fault concentration were considered.Furthermore, the water inrush coefficient method was corrected.Prediction results can indicate the safe mining in a coal mine.

Keyword：I1 coal;water inrush factor;water inrush coefficient;five figures and double coefficients method;