Pre-Support Measures for Shallow NATM Tunneling in Urban Settings

Synopsis:

Pre-support measures for urban tunneling have seen a substantial development in the recent past. Ground improvement techniques, pipe-arch and spiling methods now allow for non-disruptive tunneling at very shallow depths under sensitive structures, rail tracks and roadways. The paper presents experience gained on national and international projects built over the past decade that represent case histories and therefore may be used as guidance for the development of similar solutions for future tunneling projects at shallow depths. Reference projects include tunnels for the Washington, DC Metro, London Underground, Dulles International Airport, Busway tunnels in Boston and the Ft. Canning Tunnel in Singapore.

Pre-Support Measures for Shallow NATM Tunneling in Urban Settings
2008 North American Tunneling Conference Proceedings
June 8-11, 2008
San Francisco, California