Abstract:
To evaluate the threat of roof water inrush during the 7th coal mining in Dananhu No. 7 coal mine, based on the drilling data and other geological data in the study area, a multi-geographical information superposition approach was combined with an analytic hierarchy process to delineate the aquifer of the 7
# coal roof. Water-based zoning, and further based on the results of the water-rich zoning, the “three-map method” was used to evaluate the water inrush risk of the 7th coal roof. According to the analysis, the factors affecting the water-richness of the coal aquifer in the study area are mainly the aquifer thickness, permeability coefficient, unit water inflow, brittle-plastic ratio and others; the comprehensive factor analytic hierarchy process water-richness prediction shows that the 7
# coal roof aquifer is in the study area. The northern and northwestern regions are relatively well-watered and relatively well-watered areas, while the eastern and southeastern regions are relatively weak and relatively weak in water richness, and the middle water richness is relatively moderate. The evaluation result of the water inrush danger zone of the roof shows that the 7
# coal roof water inrush risk is relatively high, especially in the northern part, and the key prevention and control should be taken during mining.