Prevention of Water Inrushes in Deep Coal Mining over the Ordovician Aquifer: A Case Study in the Wutongzhuang Coal Mine of China
Through field observation and theoretical study, we found that the Hanxing mining area has a typical ternary structure in coal mining under high water pressure of the aquifer.This ternary structure is the Ordovician limestone aquifer-aquiclude including thin limestones-coal seam.Although the aquiclude is considerably thick, there is still a great r