Cristin-resultat-ID: 235498
Sist endret: 8. januar 2009, 11:17
Resultat
Vitenskapelig foredrag
2008

Tunnel cave-in, - Convergence confinement and 2D analysis

Bidragsytere:
  • Nghia Quoc Trinh og
  • Einar Broch

Presentasjon

Navn på arrangementet: SHIRMS 2008 - 1st Southern Hemisphere International Rock Mechanics Symposium
Sted: Perth
Dato fra: 16. september 2008
Dato til: 19. september 2008

Arrangør:

Arrangørnavn: Australian Centre for Geomechanics

Om resultatet

Vitenskapelig foredrag
Publiseringsår: 2008

Beskrivelse Beskrivelse

Tittel

Tunnel cave-in, - Convergence confinement and 2D analysis

Sammendrag

A serious cave-in failure in a headrace tunnel in Buon Kuop, Vietnam is analysed using convergence confinement (CC-method) and 2D numerical modelling (Phase 2). Results from convergence confinement method show that the method is an excellent tool for parameter study to obtain the reasonable rock mass properties and the appropriate failure criterion. The results from the analyses indicate that the properties obtained by observing and classifying the material in the weakness zone may replace expensive in-situ tests during the pre-investigation. The results also indicate that non-linear failure criteria, such as the Hoek-Brown failure criterion, are most suitable for analysing the problem. Subsequently, the obtained rock mass properties and the recommended failure criterion are used for 2D numerical analyses, in which the cave-in is well indicated. Excavation and support measures are also modelled. Even though, the methods produce results that match relatively good with what happens in reality, there are some limitations concerning groundwater and the support properties that one needs to be aware of. These limitations are discussed.

Bidragsytere

Nghia Quoc Trinh

  • Tilknyttet:
    Forfatter
    ved SINTEF AS

Einar Broch

  • Tilknyttet:
    Forfatter
    ved Institutt for geovitenskap og petroleum ved Norges teknisk-naturvitenskapelige universitet
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