Risk assessment of coal seam roof water inrush based on AHP and GIS
In order to accurately evaluate the water inrush problem of the Ⅱ1 coal seam roof in the east wing of the 12th mining area of Zhaojiazhai Coal Mine,five factors were selected as the main controlling factors for water inrush of the coal seam roof,including the height of the water conducted zone,the thickness of the aquifer within the height range of the water conducted zone,the water richness of the Neogene aquifer,the thickness of the remaining clay layer,and the fractal dimension value of the fault.The influence weight of each main controlling factor on the overall target was determined by the analytic hierarchy process,and the partition threshold of the study ar-ea was determined by the natural classification method,and finally obtained the risk assessment model for water inrush of the Ⅱ1 coal seam roof in the study area,the evaluation results were consistent with the drainage results of the later working face mining,and the ac-tual water drainage and the predicted static water reserves matched up to 96.7％,realizing the safe recovery of the Ⅱ1 coal seam.
万方数据
维普
