The 10th International Conference on Energy, Resources, Environment and Sustainable Development (ERESD 2024)

Ordovician limestone aquifer is the main water-filled aquifer of coal mining in North China type coalfield. With the increasing depth of coal mining, the geological structure situation becomes more complicated. The exploration of the stability of the floor aquifuge and the assessment of water inrush risk of the coal seam floor have gradually become one of the key links in the mine water prevention and control work. This paper took Dongjiahe coal mine as the study area, and based on the hydrogeological data and drilling data of the mine. The model adopted six evaluation factors: fault control index, coal mining depth, hydrostatic pressure, coal seam thickness, aquiclude thickness, and the lithological combination index. The comprehensive weight of the six factors was obtained by analytic hierarchy process (AHP), entropy weight method (EWM) and CRITIC method to establish an AHP-EWM-CRITIC risk index model (AEC), this model is used to evaluate the Dongjiahe coal mine in West China, and the water inrush risk zonation of the study area was determined. Finally, the calculation results of the AEC-model were compared with the traditional method, the results showed that the AEC comprehensive evaluation model was significantly improved compared with the traditional evaluation method. This method not only followed the actual observation results, but also fully considered the relative importance of the water inrush evaluation index. The results can provide a theoretical basis to support the safe mining in the coal mine.

Comprehensive Weight;AHP-EWM-CRITIC;Water Inrush Assessment;Risk Index