STATE-OF-THE-ART OF MECHANISM OF WATER INRUSH FROM BED SEPARATION AND KEY TECHNOLOGY OF PREVENTION AND PRE-CONTROL IN CHINA

The disaster caused by water inrush from bed separation has a serious impact on the safety of coal mine production. It is important to clarify the research status of its water inrush mechanism and prevention and pre-control technology to promote the process of coal mine safety construction. This paper systematically summarizes and discusses the research progress in three aspects: dynamic development mechanism of water inrush mechanism from bed separation,the prediction and pre-control technology. With the advancing process of the working panel,the bed separation presents the characteristics of dynamic development. When the bed separation of a certain layer has one or more of the three power sources which include stable confined space,stable supply water source,sufficient duration of bed separation space and water inrush pathway,there is the possibility of water inrush disaster. We carry out the treatment of disaster caused by bed separation water from two folds of prevention and pre-control. The prevention measures include building the prediction model of bed separation development based on the theory of transferring beam structure,key strata and rock beam curvature,and changing the overlying strata movement by adjusting the mining speed,cutting height and using green mining technology. The pre-control measures include the layout of geological boreholes for drainage,borehole cutting off and so on. Finally,we point out the problems that need to be solved in the current research process. The water logging detection technology is not accurate enough. The advanced drainage technology system is not perfect. Then we look forward to the new research directions of optical fiber detection,joint pre-control of water pumping (water depressurization,water blocking),non-destructive mining and so on.