Abstract:Research purposes:The internal structure of the shield tunnel is an important part of tunnel engineering, affecting the shield diameter,the construction schedule and investment,especially the road-metro shield tunnel. Based on the Sanyang road Yangtze River tunnel,the mechanics characteristic,the main construction technology, methods and their advantages and disadvantages of the internal structures and the flue sheet of tunnel are analyzed and compared in the paper.
Research conclusions:(1)With obvious advantages on waterproof ability,mechanics property and investment,the cast—in—situ method i8 recommended.(2)Prefabricated arc slab flue sheet is convenient for quality control and the stress state is good under the scour and silting-up condition in the operation,the flue sheet should be prefabricated. (3)The analysis can provide theoretical evidences and references for the large road-metro shield tunnel in future.
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