Application and Evaluation of Regional Control Technology of Limestone Water Hazard: A Case Study of the Gubei Coal Mine, North China

The coal-forming period is mainly Permian and Carboniferous in the North China coalfield, which one of main coal accumulating areas China. It characterized by high rank, abundant reserves, varieties. However, water outburst accidents originating from karst aquifers under seam floor have become a terrible disaster accompany with deep exploited progressively. Water inrush events limestone often occurred during excavation mines. To decrease risk confined ensure mining safe pressure aquifers, comprehensive exploration regional treatment are all implemented, such as drainage depressurization, curtain grouting, grouting transformation aquifers. Through ground underground, channel will be effectively filled slurry to prevent bursting into roadway, value water-inrush coefficient decreased below critical value. In study, utilizing COMSOL Multiphysics based on finite element method verify determine real layout parameters, result shows design plans satisfy engineering requirements. 13321 working face located South No.1 area has analyzed effect hazard prevention control. On basis analysis geophysical prospecting validation boreholes, it concluded that fracture block water-conducting effectively. turn, rational parameters confirmed well. Finally, Taiyuan formation Ordovician calculated, respectively. less than after treatment, safety excavating can further assured.