Abstract
Deep mining in Ordos Basin faces the threat of bed-separation water inrush (BWI), so it is necessary to carry out BWI risk assessment before mining. However, the existing BWI risk assessment methods fail to provide a universal risk classification standard. In this paper, taking three coal mines in Ordos Basin as research cases, the water resistance of fractured rock mass was analyzed, and a BWI coefficient (BWIC) method for BWI risk assessment was established. Firstly, by comparing the weight of each BWI-related factor, the formula for calculating the thickness of equivalent water-resisting layer of fractured rock mass was derived. The weight of each BWI-related factor was obtained by entropy weight method. Secondly, based on the stress arch theory, the overall BWIC in bed separation zone corresponding to different excavation lengths was obtained. BWIC was expressed by the ratio of the Cretaceous water pressure to the total thickness of the unbroken water-resisting layer and the equivalent water-resisting layer of the fractured rock mass. Finally, by comparing the value range of the overall BWIC in the bed separation zone corresponding to the excavation length with and without BWI, the standard of BWI risk classification was determined. The application results verified the scientificity of BWIC method and the universality of the BWI risk classification standard proposed in this paper.
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