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Abstract Research purposes:The first-stage project of Lanzhou metro lines 1 has two times under through the Yellow River, it's the first traffic engineering tunnel about the Yellow River, which is domestic initiate engineering. The tunnel located in the Qilihe fracture collapse basin of Lanzhou city，it belongs to the continuous long distance under through Yellow River tunnels under the condition of strong permeable sandy gravel. In addition to this，considering the factors such as lines conditions，station，nearby existing bridge and under through river and dike，the Yellow River tunnel of Lanzhou metro has a larger difficulty of design and construction. It should be fully argument in the early time，well- designed，to obtain the best design scheme and be conductive for engineering construction.
Research conclusions:In this paper, the research based on the external environment about Yellow River tunnel of Lanzhou metro analyzs the design difficulty of this project，to obtain design scheme of Yellow River tunnel. The section adopts these measures such as double-line ipsilateral upstream passing round bridge pier, two lines single hole tunnels， indirect control mode slurry shield construction，prefabricated reinforced concrete segment lining, two types waterproofing measure. The ancillary facilities such as air shaft，connected aisle and waste water pump room，the fire protection and rescue facilities such as composite section evacuation platform，air shaft，connected aisle and floodgate and so on are set up，thus a whole set of completed design program of Yellow River tunnel take shape. The related conclusion and experience could enrich the building technique of under through river tunnel in domestic; it could provide reference and consult for the construction of subsequent similar engineering.
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2014, Vol. 31 
