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| The Structural Design of Contact Channel of the First Domestic Metro Cross-river Interval |
| SUN Xue-bing |
| China Railway Siyuan Survey and Design Group Co. Ltd, Wuhan, Hubei 430063, China |
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Abstract Research purposes: The contact channel of Wuhan Metro Line 2, is the first built in the sand layer under Yangtze River of domestic metro. With Pump room of 3# contact channel bears the load of elevating head about 56 m, so it has the characteristics of heavy loads and construction of high risk. There is no precedent for reference, and a reasonable structural design solution should be used to ensure the structural safety and construction safety.
Research conclusions: In this paper, research and analysis on 3# contact channel with pump room are made, with the following main conclusions: (1)Practice has proved that the use of the river bottom sand freezing method is safe and reliable. But it should be possible to optimize the effective volume of the pump, reduce the sump volume, reduce the risk of freezing construction. (2)The conventional rectangular cross-section sump design is difficult to satisfy dual requirements of the freezing construction and structure of the high-pressure shear. (3)The contact channel taking the structure of the wall of variable thickness design and sump using nearly oval cross-section design, made an unexpected result which not only overcomes the problem of high pressure shear, the new structure type but also greatly improves force structure, improves structural safety affluence. (4)Currently this kind of contact channel structure type can provide the reference for the similar tunnel design.
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Received: 29 September 2013
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2014, Vol. 31 
