An Improved Fuzzy Comprehensive Evaluation System and Application for Risk Assessment of Floor Water Inrush in Deep Mining

In view of the characteristics of outburst, hysteresis and strong disaster caused by floor water bursting in deep mining, scientific and reasonable water inrush risk evaluation in advance is an important means to prevent water inrush in deep mining. In this study, an improved fuzzy comprehensive evaluation system for the risk assessment of floor water inrush in deep mining was established, and an veracious and feasible system method was proposed to evaluate the water inrush risk of floor water in deep mining. The evaluation indices were divided into continuous variable indices, which were quantitatively graded according to floor water inrush risk and discrete variable indices, which were qualitatively graded by expert opinion. According to the characteristics of continuous variables and discrete variables, the triangular fuzzy function and Delphi method were used to calculate the membership degree, respectively, and the analytic hierarchy process was applied to analyze the weights. In order to test the accuracy of the evaluation system, Evaluation of six engineering practices were carried through with hydrogeological data of six mining faces in China. The results are consistent with the field-observed results, which shows that the approach is reasonable and feasible, providing a powerful tool for the risk assessment of floor water inrush in deep mining.