From the sectional perspective , the coalfield of the North China is characteristic of multilayer porous and karst-fissure aquifers which are connected together hydraulically.From the plane view , every aquifer is characteristic of irregular spatial distribution and complicating boundary position as well as boundary conditions . Although the problems of preventing water break through under coalbed and of forecasting the water inflow in mine in the coalfield of the North China have been studied for over four...
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