Tunnelling-induced surface settlement: on the choice of soil constitutive model
| Autor: | Ahmed Rouabhi, Sara Rachdi, Michel Tijani, Emad Jahangir |
|---|---|
| Přispěvatelé: | Centre de Géosciences (GEOSCIENCES), MINES ParisTech - École nationale supérieure des mines de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL) |
| Rok vydání: | 2019 |
| Předmět: |
Surface (mathematics)
Environmental Engineering Settlement (structural) critical state [SPI.GCIV.GEOTECH]Engineering Sciences [physics]/Civil Engineering/Géotechnique Constitutive equation constitutive models 0211 other engineering and technologies Excavation surface settlement 02 engineering and technology 15. Life on land Tunnelling 021105 building & construction 11. Sustainability Geotechnical engineering Quantum tunnelling Geology 021101 geological & geomatics engineering Civil and Structural Engineering |
| Zdroj: | European Journal of Environmental and Civil Engineering European Journal of Environmental and Civil Engineering, Taylor & Francis, 2019, ⟨10.1080/19648189.2019.1639078⟩ |
| ISSN: | 2116-7214 1964-8189 |
| Popis: | International audience; Increasing tunnel excavations in dense urban areas faces the issue of accurately predicting tunnelling-induced surface settlement. The quality of those predictions closely depends on the choice of soil constitutive model. In this context, some widely used soil models in engineering practice not only fail to reproduce some characteristics of soil behaviour on the constitutive level but also lead to shallower settlement. This article studies the influence of the choice of the soil model on tunnelling-induced displacements through a case study. Three different soil models are used to simulate soil behaviour, namely the hardening soil model, the modified cam clay model and a proposed enhanced critical state model incorporating deviatoric and volumetric hardening. The proposed model is first validated on different triaxial tests and its features are especially highlighted for overconsolidated soils. This model is then compared to the other two models on tunnelling simulations. The results show great predicted settlement sensitivity to the choice of soil model. The proposed model engenders deeper settlement and, consequently, enables a more conservative design. Furthermore, parametric studies demonstrate significant disparities in the predicted displacements by the different soil models depending on the initial conditions and the stress relaxation ratio. |
| Databáze: | OpenAIRE |
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