Pre-Pumping Technology in Gob-side Entry Retaining of Serious Outburst Coal Seam

gas control technology in single low permeability outburst coal seam is difficulty and restricted. The implementation of coal-bed gas pre-pumping is restricted by the construction space, pre-pumping time, which directly affects the drainage standard time and safety of production in the mining face. The research and application of pre-pumping technology in gob-side entry retaining not only reduce the disturbance to outburst coal body, but also has a protection effect for the adjacent section. It is an effective regional gas control measures.