The fuzzy comprehensive evaluation of water and sand inrush risk during underground mining

Abstract

Taking the geological conditions of a typical coal mine as an example, a fuzzy comprehensive estimation model is developed for judgment of mine water and sand inrush caused by underground mining. According to the geological prototype, three basic conditions of water and sand inrush disaster induced by mining under thin bedrock and thick loose aquifer are revealed. Using analytic hierarchy process (AHP) to determine the weights of evaluation index factors, nine evaluation factors are chosen, and then the degree of membership of evaluation factors is determined through qualitative and quantitative two ways. The dangers of water and sand inrush in the study area are quantitatively analyzed. The risks are divided into four ranks, through calculating, the hazard level of water and sand inrush disaster in study area is 3, it is high risk. The fuzzy system is efficient and easy to use, and the evaluation results are in good accordance with the reality, and provide the decision basis for the safety production of the coal mine.