Mine water inrush forecasting during the mining under waters

Stress and deformation of the rock masses around the mine seam induced by mining can affect the water system and the aquifuge within the mining fields region and then often causes coal mine water hazards during mining under waters. In this study, based on the geological and hydrogeological condition of the mining fields and considering the water flowing fracture zone and the caving zone, fine model describing the rock structures, rock properties and effects of mining activities is established. The groundwater seepage evolution is analyzed after mining and the water inrush is forecasted on roof of working faces, adopting the seepage mechanics theory. According to the water inrush forecasting results in different mining depth, the safely mining depth under waters is decided. The research results indicate that strip-partial mining with coal pillars in coal seams under the waters is effective method during mining under waters and after mining to a certain depth, the coal seam can be mined fully safely. The study provides a theoretical basis and practical guidance for decision-making of “three-underground” mining, coal mine water hazards prediction and prevention