Risk assessment of floor water inrush into coal seam based on entropy weight-fuzzy analytical hierarchy process method
The No.10 coal seam of Xuehugou coal mine is taken as the research object.Based on the analysis of the geo-logical and hydro-geological conditions of the coal mine,the main control factors affecting the coal floor water inrush the No.10 coal seam are determined.Subsequently,the methods such as entropy weight(EW)and fuzzy analytical hierarchy process(FAHP)are combined to calculate the weight of each main control factor.Finally,the vulnerability index model of the floor water inrush of No.10 coal seam is established to assess the risk of floor water inrush of the coal seam comprehensively.The studies show that the main controlling factors affecting the floor water inrush No.10 coal seam are the water pressure of Ordovi-cian limestone aquifer,the water richness of Ordovician limestone aquifer,the thickness of aquifuge,the thickness of brittle rock as well as the floor failure depth;Vulnerability index model for No.10 coal floor inrush is shown as:Ⅵ=0.211 2 f1(x,y)+0.308 6 f2(x,y)+0.149 4 f3(x,y)+0.190 9 f4(x,y)+0.139 9 f5(x,y);The floor water inrush danger zone and secondary danger zone of No.10 coal seam are mainly distributed as a belt shape in the northwest part of the coal mine.
coal seam floorrisk assessment of water inrushentropy weight-fuzzy analytical hierarchy process methodvulnerability index methodXuehugou coal mine
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