Risk evaluation on water and sand inrush in ecologically fragile coal mine

This paper studied the risk evaluation methods of water and sand inrush from coal roof based on the dimen- sionless multi-factor information fusion technique. Taking Yushenfu coal mine as example,based on the analysis of wa- ter inrush mechanism,the paper identified four key factors affecting the water inrush and sand inrush from the roof, which include sand thickness,water-richness of aquifer,effective thickness of aquiclude layer and mining space. Each factor was dealt with dimensionless quantity according to the structural and hydro-geological conditions, and the weights of each factor was determined by entropy weight method,synchronously. Then,the dimensionless multi-factor information fusion model for the risk evaluation Yushenfu coal mine was established on the basis of the ArcGIS. Using the model,the authors got the water inrush and sand inrush risk zoning map in Yushenfu coal mine. The result shows that it is reliable to apply the model on the evaluation and partition of the water inrush and sand inrush from the coal roof in Yushenfu coal mine.