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 language | English |
|---|---|
| Title of host publication | Tunnels and metropolises |
| Subtitle of host publication | roceedings of the World Tunnel Congress '98 on Tunnels and Metropolises, São Paulo, Brazil, 25 - 30 April 1998 |
| Editors | A.A. Ferreira, A. Negro |
| Publisher | CRC Press / Balkema - Taylor & Francis Group |
| Pages | 215-218 |
| ISBN (Print) | 9789054109372 |
| Publication status | Published - 1998 |
| Event | World Tunnel Congress '98: Tunnels and Metropolises - Sao Paolo, Brazil Duration: 25 Apr 1998 → 30 Apr 1998 |
Conference
| Conference | World Tunnel Congress '98 |
|---|---|
| Country/Territory | Brazil |
| City | Sao Paolo |
| Period | 25/04/98 → 30/04/98 |