Entity

Time filter

Source Type


Dollmann O.,D2 Consult International GmbH | Horny U.,D2 Consult International GmbH | Schulter A.,D2 Consult International GmbH
Underground - The Way to the Future: Proceedings of the World Tunnel Congress, WTC 2013 | Year: 2013

Large tunnel cross sections in soft ground require a design methodology that can adequately deal with the complex stress state surrounding the underground opening and the associated excavation stages, especially at bifurcations where adjacent tunnels merge to create a transition zone of a larger cross-section. Innerurban areas and shallow overburden conditions add to the risks that have to be addressed as part of the tunnel design. For a four laned highway tunnel advanced conventional tunneling design methodologies integrated with design and construction risk management schemes have been used to meet major risk-bearing aspects; namely, large tunnel cross section (area of up to 470 m2), a shallow overburden (as low as 10.5 m), soft-ground conditions (cemented sands and gravels) and the location of the tunnel inside an urban area. Special emphasis was paid to controlling the settlement risks associated with tunneling via oriented risk triggers and an alarm plan. © 2013 Taylor & Francis Group. Source


Agaiby S.W.,D2 Consult International GmbH | Schulter A.,D2 Consult International GmbH | Horny U.,D2 Consult International GmbH | Dollmann O.,D2 Consult International GmbH | Ahmed S.M.,Ain Shams University
Geotechnical Special Publication | Year: 2013

Large tunnel cross-sections in soft ground require a design methodology that can adequately deal with the complex stress state surrounding the underground opening and the associated excavation stages; this is especially the case at bifurcations where adjacent tunnels merge to create a transition zone of a larger cross-section. Vertical profile design constraints may further lead to shallow overburden conditions that add to the risks that have to be addressed as part of the tunnel design. This paper presents an advanced NATM design methodology that is integrated with design and construction risk management schemes to meet major risk-bearing aspects; namely, large tunnel cross-section (area of up to 470 m), a shallow overburden (as low as 10.5 m), soft-ground conditions (cemented sands and gravels), and the location of the tunnel inside an urban area. Special emphasis was paid to controlling the settlement risks associated with tunneling via an oriented risk triggers and alarm plan. © 2013 American Society of Civil Engineers. Source

Discover hidden collaborations