Abstract：Research purposes: For discussing the pollutant diffusion of urban double—portal tunnel，the influence of the outlet of the tunnel on the pollutant diffusion at the inlet of tunnel is analyzed．Using CFD and gas diffusion equation。the simulation analysis is made for the CO diffusion of one urban double—portal tunnel．and the discussion is made on the necessity of building the partition wall in the middle of outlet and inlet of double—portal tunnel．
Research conclusions:The simulation result shows under conditions there iS no partition wall and the design threshold value of the outlet of the tunneliS 200 ppm，some CO concentrations of the inlet of the tunnel can reach at 60 ppm．And the maximal C0 concentration of inlet of the tunnel is 20 ppm when there is a partition wall．It can be seem from abve it iS very necessary to build a partition wall in the middle of outlet and inlet of double—portal tunnel．which can improve the environment of the inlet of the tunnel．
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Zhong Xingcan，Zeng Zhen Distribution of Harmful Gas Concentration in Highway Tunnel with NaturalVentilation[J]．Jonrnal of Railway Engineering Society，2006(9)：44-49．
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Deng Shunxi，Zhang Guang，Li Xi，etc．Simulation of Pollutant Diffnsion near Extra Long Highway Tunnel Portal with Finite Element Method[J]．China Journal Of Highway and Transport，2006(3)：59一64.
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2010, Vol. 27 
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