ABSTRACT ONLY:
Urban development past and present imposed severe alignment and construction restrictions on a new tunnel bored beneath the Allegheny River for Pittsburgh’s light-rail system. Careful preparation and innovative operation enabled a tunnel-boring machine to complete the twin bores successfully despite challenging ground conditions, numerous obstructions, steep grades, tight curves, and shallow cover.
BIOS:
Keith Wargo, P.E., is the director for the North Shore Connector project for the Port Authority of Allegheny County, of Pittsburgh. Paul A. Roy, P.E., M.ASCE, is the national director of tunneling and underground structures and works in the New York City office of AECOM–USA, which has its headquarters in Los Angeles. Marco D. Boscardin, P.E., Ph.D., F.ASCE, is president of Boscardin Consulting Engineers, Inc., of Amherst, Massachusetts. Andy J. Miller is technical director of tunneling and works in the London office of AECOM. Kevin DiRocco, P.E., M.ASCE, is a senior engineer for GEI Consultants, Inc., of Woburn, Massachusetts.