Prevention and Control of Harmful Gas Leakage in Overburden Goaf

The Jurassic system in Datong Mining Area belongs to the close coal seam mining, harmful gas in the overburden goaf is easy to escape into the lower working face, which seriously threatens the safety of operators. The simulation test system of similar materials was used to study the laws of overburden fracture migration and fracture distribution, combined with field measured data, the process of harmful gas leakage is analyzed. Based on the principle of dynamic balance of multi-level goaf flow field, the raising pressure ventilation control system to prevent harmful gas leakage is designed. The technical research on 8209 working face raising pressure system in Sitai Mine is carried out, and the reasonable rising pressure is determined by calculation. The application results show that the raising pressure technique can effectively curb the harmful gas leakeage in overlying goaf and ensure the safe mining of the lower face.