The Improved AHP Vulnerable Index Method Based on GIS

The AHP method is one of the key technologies in predicting coal seam floor water inrush. But, the traditional AHP method, which is based on 1-9 scale, often has some problems. For example, the consistency effect is not ideal. Therefore, through the research on these problems, the technique of the improved AHP vulnerable index method, which is based on 10/10-18/2 scale, was put forward. Then, the vulnerability evaluation of the No. 3, 9 and 15 coal in Chengzhuang coalmine was taken as an example. Firstly, based on the establishment of the thematic layers diagrams of eight main factors, the weight of each main factors was determined using the improved AHP method. Then, the vulnerability evaluation model of the floor water inrush from the Ordovician limestone aquifer was constructed. Finally, the vulnerability zoning of each part in the study area of the No.3, 9 and 15 coal mine were obtained. The results showed that the judgment matrix constructed by the improved AHP method has better consistency effect. Furthermore, compared with the results of the traditional water inrush coefficient method, the results of the improved AHP vulnerability index method, which can truly reflect the nonlinear dynamic process of the floor water inrush under multi-factor affection, are more consistent with the actual. © 2017, Editorial Department of Earth Science. All right reserved.