Safe and efficient mining technology for full-mechanized caving face of deep mine with capacity of ten million tons

Based on a highly intensive mining mode of “one mine, one coalface, ten million tons”, safe and efficient mining technology for full-mechanized caving face of deep mine with capacity of ten million tons is proposed to deal with technical problems such as high ground pressure, high ground temperature, high water pressure and easy spontaneous combustion of coal seam in Longgu coal mine. The surrounding rock control technology was researched to effectively control the high ground pressure. The treatment and utilization technology for high temperature and heat hazard was initiated to lower the average temperature in main workplaces by 8 L. The treatment and utilization technology of high-pressure massive water gushing was adopted to ensure safe mining under the condition of 8 MPa water pressure in deep mine. A precautionary and preventive technology for spontaneous combustion of coal seam of “coal body inhibition + air-leakage control + local inerting” is proposed to stop spontaneous firing of coalface in high ground temperature. The research results have effectively solved the technical difficulties and have realized safe and efficient production for deep mine with capacity of ten million tons.