Gas Distribution Mechanism in Goaf during Combined Drainage of Upper Corner Buried Pipeline and Intubation for Thick Coal Seams

Abstract The prevention of gas overrun in the panel is one key issues on green mining. In this paper, a physical goaf model was established based geological production conditions coal seam mine Henan Province, and combined drainage technology by burying spilling pipeline upper corner proposed. Fluent software used to simulate changes mass fraction flow field distribution when extracted from without pipeline, with single buried combination spilled pipelines. Analysis simulation showed that absence pipelines, concentrations both return airway are up 1.2%, which failed meet control standard mine. case average concentration 0.7%, only 1.1%, standards mine’s panel. However, maximum reduced 1.1% 0.6%, indicates can greatly reduce concentration, but there still gap standard. Therefore, impacts lengths pipelines different goafs effect were studied, it concluded reasonable length under 20 m. This not solves problem also realizes utilization resources goaf. research results guiding significance for laying corners U-shaped ventilation