Structural Design Models for Tunnels

[gianniorlati]

Structural Design Models for Tunnels

Author: H. Duddeck, J. Erdmann | Size: 1.96 MB | Format: PDF | Quality: Scanner | Publisher: Braunschweig University | Year: 1982 | pages: 9 | ISBN: n.a.

The ITA working group on structural design models for tunnelling will publish in 1982 the replies to a questionnaire in synopsis form. In continuation of that work thè results of an investigation imo thè most common design models for soft ground tunnels are given by way of a comparative review of progress to date in this field. The main differences in the assumptions with regard to the different models are stated. Diagrams for thè hoop forces, bending moments and radial displacements illustrate the differences in the design values evaluated for three different models — the continuum model, the Muir Wood design molivi and the bedded beam model without bedding at the crown region. A comparison with free parameters necessitates analytical solutions, so only circular crosssections are investigated. Nevertheless, the results of the investigation may also be valid for non-circular crosssections and more refined numerica! analyses. There is a trend towards agreement on thè basic assumptions and on thè design model in regard to both shallow and deep tunnels.

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