Steel pipe umbrellas have been extensively used for tunnelling under difficult conditions or at tunnel portals since the early seventies. Despite the large number of applications throughout the world, several different design approaches are usually used since different assumptions on how the umbrella pipes behave under loading have been proposed. A comparison of the usually applied design methods: analytical approaches such as a simple beam with two supports or a beam on multiple supports and two or three dimensional numerical approaches where the umbrella pipes are modeled as a reinforced rock arch or individually; are presented and the results concerning a low overburden tunnel are discussed. The feasibility of the methods to forecast the displacements and the stresses acting on the pipes has been dealt with in particular
COMPARISON BETWEEN DIFFERENT DESIGN APPROACHES FOR STEEL PIPE UMBRELLAS AT TUNNEL PORTALS / Da SILVA, J. C. B. J.; Peila, Daniele. - ELETTRONICO. - 1:(2012). (Intervento presentato al convegno 3º Congresso Brasileiro de Túneis e Estruturas Subterrâneas - Seminário Internacional “South American Tunnelling – SAT 2012” tenutosi a San Paolo nel 22 March 2012).
COMPARISON BETWEEN DIFFERENT DESIGN APPROACHES FOR STEEL PIPE UMBRELLAS AT TUNNEL PORTALS
PEILA, Daniele
2012
Abstract
Steel pipe umbrellas have been extensively used for tunnelling under difficult conditions or at tunnel portals since the early seventies. Despite the large number of applications throughout the world, several different design approaches are usually used since different assumptions on how the umbrella pipes behave under loading have been proposed. A comparison of the usually applied design methods: analytical approaches such as a simple beam with two supports or a beam on multiple supports and two or three dimensional numerical approaches where the umbrella pipes are modeled as a reinforced rock arch or individually; are presented and the results concerning a low overburden tunnel are discussed. The feasibility of the methods to forecast the displacements and the stresses acting on the pipes has been dealt with in particularPubblicazioni consigliate
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https://hdl.handle.net/11583/2499899
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