| With the deep mining of coal,mine water hazards happens from time to time.Among them,the bed-separation water inrush caused by the breakage of hard overburden has no obvious precursor and the coming force is fierce.We need to pay attention to it,so as to evaluate its danger and prevent it reasonably.The development of bed-separation water generally depends on the overburden structure of coal seam,and it is urgent to study the development law of bed-separation water in overburden with coal seam mining.At present,there are some deficiencies in the study of zonal prediction of the risk of bed-separation water inrush,resulting in some mine water hazards have not been effectively prevented.Combining with the mechanism of bedseparation water inrush caused by breaking of hard overburden,the influencing factors of hydrodynamic inrush are analyzed concretely,and the risk assessment model of bedseparation water inrush caused by breaking of hard overburden is established,which is of great value for ensuring the safety of mine production.Taking 104 and 106 mining areas of Yangliu Coal Mine as the research area,combined with the historical data of bed-separation water inrush,the engineering geological and hydrogeological conditions of 104 and 106 mining areas were sorted out and analyzed.Through theoretical calculation of the development horizon of bedseparation,the development position and inrush mode of the bed-separation water are analyzed and judged.The thickness of hard rock,coal seam,water barrier,aquifer and hydrostatic head are selected as the main influencing factors according to the mechanism of hydrodynamic inrush of separated layer.The relationship between bedseparation water inrush caused by breaking of hard overburden and its influencing factors is analyzed,and the comprehensive weights of main controlling factors are determined by using entropy weight method and fuzzy analytic hierarchy process.Through ArcGIS analysis and processing,the contour maps of the main controlling factors are drawn,and the risk assessment model of bed-separation water inrush caused by breaking of hard overburden is established by combining the weights of each factor.The risk assessment zoning of separated layer water hazards in 104 and 106 mining areas is carried out by using the evaluation model,and the model is tested with the actual data of bed-separation water inrush in Haizi Coal Mine.The results show that the risk assessment results of the model are satisfactory.Finally,combined with the risk assessment results of water inrush in the study area,the prevention and control measures of water inrush in the separation layer are put forward. |
