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North Shore Connector Tunnel Project, Pittsburgh, USA


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Author A J Miller, M D Boscardin and P A Roy


The North Shore Connector Project for the Port Authority of Allegheny County
involves TBM tunnelling twin light rail tunnels through cohesive soils and rock
under the Allegheny River and a narrow city street. Along the tunnel alignment
are a listed historic building on shallow foundations as well as modern
buildings on deep foundations; one major office block was actually constructed
directly over the alignment during the latter phases of design process. This
paper provides an overview of the general site conditions, tunnel design and the
technical basis for excavation support and tunnelling decisions. Deformation
limits, ground improvement, monitoring and mitigation plans are also

Project construction has now commenced and a brief summary of progress to
date is included in this paper; this will be updated for the presentation to be
made in Melbourne.