Abstract：Abstract: Research purposes Underwater tunnel as one of the important ways of railway, highway and other transportation passage across river has been used widely. Taking Oujiangbeikou tunnel project of Wenzhou city region railway S2 as an example, this paper studied the factors affect the tunnel site, such as geological conditions, control point alone the line, connection conditions of two banks, tunnel operation safety and so on, reasonably selected tunnel site scheme; aiming at the characteristics of this project, reasonably selected the form of tunnel section, disaster prevention and rescue scheme, which can provide a reference for similar underwater tunnel project.
Research conclusions：(1)Through comparing the difference of scheme of bit line between upstream and downstream in geological conditions, construction difficulty, operation period safety, control point alone the line, connection conditions, the downstream scheme of bit line was recommended with better geological conditions, lower constructed difficulty, less subsidence during the operation period, lower impact on the surrounding plan, which avoided the silt layer of bottom of tunnel, foundation piles of flood embankment and important buildings on the bank. (2)Analyzed the evacuation routes arrangement at domestic and foreign, and combining with features of the project, studied and used combination mode of setting transverse connection channel with special vertical evacuation routes + mid-partition. (3) Analyzed the uneven settlement caused by the complex uneven strata and thickness variation of deep soft soil which affect to the tunnel structure, shield tunnel with double lining structure was recommended. (4)According to the operator and field conditions, set the exhaust tract of tunnel, combined with the arrangement of evacuation routes, compared the tunnel section form of "single tunnel double track without mid-partition+ bottom evacuation routes", "single tunnel double track+the mid-partition" and "double tunnel double track", "single tunnel double track+ the mid-partition" was recommended with its better operation safety. (5)This paper mainly analyzed the tunnel disaster prevention of ventilation and smoke discharge, adopted the smoke exhaust modes of longitudinal ventilation and smoke discharge flue. To ensure personnel evacuation, guarantee that safe passage positive value was 30Pa, and control the smoke emissions direction of tunnel. (6)The research conclusion has significant reference for the construction of underwater tunnel project in the deep soft soil layer.
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