Structural design models for tunnels in soft soil
Journal Article
·
· Underground Space; (United States)
OSTI ID:7136781
In 1982 the ITA (International Tunnelling Association) working group on structural design models for tunnelling published the answers to a questionnaire in the form of a synopsis. As a continuation of that work, results of an investigation on design models for soft ground tunnels are presented and a comparative review of the progress to date in this field is given. The main differences in the assumptions entering the different models are stated. Diagrams for the hoop forces, bending moments and radial displacements shows the differences in the design values evaluated for three different models: (1) the continuum models; (2) the design model by Muir Wood; and (3) the bedded beam model without bedding at the crown region. Because a comparison with free parameters necessitates analytical solutions, only circular cross-sections were investigated. Nevertheless the results of the investigation also may be valid to a great extent for noncircular cross-sections and a more refined numerical analyses. It can be shown that there is a trend toward agreement on the proper assumptions and on the design models applied either for shallow or for deep tunnels. As should be expected, the bending moments are sensitive with regard to the model chosen, whereas the hoop forces in the tunnel ring are rather unaffected by the change of ground and lining properties. The significance of the nonlinearity due to geometrical deformations or to plastic behavior is demonstrated from specific examples.
- Research Organization:
- Univ. of Braunschweig, West Germany
- OSTI ID:
- 7136781
- Journal Information:
- Underground Space; (United States), Journal Name: Underground Space; (United States) Vol. 9:5-6; ISSN UNSPD
- Country of Publication:
- United States
- Language:
- English
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