The characteristic and generant condition of coal mine water-bursting calamity in China

The coal mine water-bursting is very severe in China. The important characters, such as the broad distribution with height frequencyt, groundwater is the mainly source, water-bursting's channels mainly include the producing fracture and karstic falling column. There are many man-made factors relate to it such as the lacking of geohydrological reconnaissance, the unbefitting mining systems (even get out of line), the supervisal and preventions besides the natural geology conditions.