Research Of Prevention And Control Technology On Coal And Gas Outburst In The High-Speed Railway Tunnel Construction

Relying on coal and gas outburst in tunnels, combine with coal and gas outburst mines, building numerical model of coal and gas outburst in tunnel by UDEC 4.0 & FLAC 3D 5.0, analysis Mechanical condition of working face before cross-cutting coal and sate of rock cross-cut coal. Prediction of coal & gas outburst in stage of geological investigation and construction are researched. Prevention and control measures of coal & gas outburst and effect assessment are researched.The main conclusions are as follows:(1) The numerical model of steeply inclined coal seam is established by using UDEC software. The mechanical state of coal and gas outburst is analyzed, and the formation and development of coal and gas outburst is a series of mechanical process.(2) By using FLAC 3D 5.0 software to establish the numerical model of tunnel axis line big angle skew and steeply inclined coal seam, the analysis of coal and gas outburst tunnel Crosscut Exposing Coal Safety, should be in from the outburst coal seam 2-5m implementation measures for outburst prevention; outburst after the formation of the cavity of the tunnel will influence.(3) Coal and gas outburst tunnel should be in accordance with the gas forecast, coal uncovering outburst prevention technology implementation and verifying outburst prevention effect. Finally, uncovering coal. Coal uncovering outburst in advance boreholes for prevention and control of coal and gas outburst, the key lies in the boreholes and construction, advancing hole can not only detect the front can also be pre discharge of gas.(4) Researching the different aperture of single hole, different spacing effect of porous pressure relief, joint layout optimization of porous.