Abstract
Based on the analysis of the present situation and existing problems of coal and gas outburst in the second South well of Liziya coal mine, and adhering to the concept of comprehensive gas control, the field test and design of the main mining K1 coal seam are carried out respectively from the outburst prevention prediction sensitive index and critical value, regional outburst prevention measures, hydraulic fracturing permeability enhancement measures and local outburst prevention measures. The critical value of outburst prevention prediction sensitive index in the test area is: k1m = 0.40 Ml / g · Min1 / 2, Sm = 4.3kg/m; in the production area, the bottom rock pre drainage tunnel through layer drilling pre drainage, the coal tunnel through layer strip pre drainage, the double tunnel layout drilling pre drainage are used to improve the gas drainage rate by hydraulic fracturing and permeability enhancement measures, fundamentally eliminate the risk of coal and gas outburst, and realize the safe production of the mine.
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call