Research on mechanism and evaluation of coal seam bottom water bursting

Abstract：In order to solve problems of coal seam bottom by bursting in northern China coal mining, the water harms and water preventing technology are introduced.Karst crevice water storing condition and migration laws, as well as the law of the Ordovician limestone karst development are expounded.Combining with abroad governing water theory, discusses the water bursting mechanism of coal floor and sum up the features of the coal floor sudden flood water, mechanism and evaluation way.By using of Zhengzhou mining area Chaohua mine 22081 working face, the actual effect of governing water of"Bursting Water Modulus Act" is proved.Finally, several countermeasures of coal seam bottom water bursting are brought forward.

Keyword：karst fissures water;coal seam bottom water bursting;water bursting mechanism;water bursting valuation;