Risk Assessment of Water Inrush from the Floor of No. 15 Coal Seam in Yuecheng Mine
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Based on the analysis of hydrogeological data and drilling data of Yuecheng Mine, six main controlling factors affecting the water inrush of main coal seam floor are determined as Aohui water level elevation, 15 coal seam floor elevation, water pressure of aquifer, thickness of water-barrier layer, water inrush coefficient and structure distribution. The CRITIC method and interval variable weight theory are used to determine the variable weight of the index, and the spatial processing function of Arcgis is combined to obtain the assessment zone of water inburst vulnerability in the study area. The areas of safe zone, safe zone, transition zone and dangerous zone within the well field are 11.15%, 36.16%, 32%, 17.28% and 3.37%, respectively. The dangerous areas of floor water inrush are generally weak, and the dangerous areas and more dangerous areas are mainly concentrated in the areas where the subsidence column develops and the water inrush coefficient is large.
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