Abstract
In case of construction of an additional structure outside of the tunnel, enlargement from the inside would be more economical and time-saving comparing with conventional cut and cover method. This paper presents how to enlarge the segmented lining tunnel under soft ground of water-bearing soil by application of slurry shield tunneling technique, and how to design enlarged structure of the tunnel. Furthermore the design problems are clarified through prototype experiment to build composite structure with primary segmental lining which is already affected by stress prior to placing secondary lining. (Author abstract)
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