Face Stability Calculation for a Slurry Shield in Heterogeneous Soft Soils

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Abstract

The minimal support pressure needed at the tunnel face can be calculated using a wedge stability analysis. Current methods have been presented only for a homogeneous soil at the tunnel face. This Paper investigates the influence of heterogenity of the soil on the angle of slip and the minimal support pressure. It is found that the influence of horizontal layer boundaries is significant, especially at the top of the tunnel face. In case of a soft layer over a relatively stiff layer the minimal support pressure is greater than would be calculated by interpolation of the support pressures calculated for the separate layers.
Original languageEnglish
Title of host publicationTunnels and metropolises
Subtitle of host publicationroceedings of the World Tunnel Congress '98 on Tunnels and Metropolises, São Paulo, Brazil, 25 - 30 April 1998
EditorsA.A. Ferreira, A. Negro
PublisherCRC Press / Balkema
Pages215-218
ISBN (Print)9789054109372
Publication statusPublished - 1998
EventWorld Tunnel Congress '98: Tunnels and Metropolises - Sao Paolo, Brazil
Duration: 25 Apr 199830 Apr 1998

Conference

ConferenceWorld Tunnel Congress '98
CountryBrazil
CitySao Paolo
Period25/04/9830/04/98

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