| The overlying strata of the coal seam in Guojiahe coal mine are mostly interbedded soft and hard strata,so it is easy to result in serious separation water inrush,and affect the normal production of the coal mine.At present,the mechanism and prevention of separation water inrush are still in exploration,and there is no systematic and effective prevention method.Therefore,it is of-great theoretical and practical significance to carry out the research on the law of separation water inrush as well as the prevention and control technology.Through the comprehensive analysis of the data,it is found that the separation water is vertically formed in the separation space between the conglomerate(hard rock)of Cretaceous Yijun Formation and mudstone and sandy mudstone(soft rock)of Jurassic Anding Formation,and separation space between mudstone and sand/mud stratum in Anding Formation;The recharge sources of the separation water are mainly lateral recharge of Jurassic aquifer and vertical recharge of Cretaceous Luohe Formation aquifer,and the water passage is mainly the water flowing fractured zone.The separation water inrush in the working face is mostly located near the inclined shaft and the square position.The separation water inrush is featured with obvious signs,abnormal mine pressure presentation,limited total water inflow subject to the separation space,short water release time and large instantaneous water inflow.On this basis,the ground release holes were constructed at locations where separation water inrush may occur(the final holes are located within the 50 m caving zone above the roof).During backstopping,the drill holes and goaf areas are connected with each other through holes,and release separation water in advance and destroy the impermeability property of the separation space.There is no separation water inrush disaster through the practice of two working faces,which shows that the scheme has a certain prevention and control effect. |
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