Abstract：Research purposes: Ventilation technology is one of the most important parts of tunnel construction and it directly affects the tunnel construction schedule and construction cost． With the rapid development of high － speed railway construction in recent years，the more and more and longer and long railway tunnels are built in China． Thus the ventilation becomes a difficult problem to be dealt with． Taking the ventilation technology for the main portal of the 1# inclined shaft of Qingyunshan Tunnel as an example，this paper introduces the forced ventilation technology used for the tunnel construction．
Research conclusions: With the development of ventilating device，the high wind pressure and large air volume ventilation machine with high tenacity and large － diameter flexible ventilating duct has been developed，so it is possible to use the forced ventilation technology for long tunnel． This method is simple，convenient and fast． By reasonable application，the construction cost can be cut，and the good construction environment and construction schedule can be ensured．
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2012, Vol. 29 
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