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Interaction of Parallel Tunnels; Case Study: Interaction of Towhid Tunnel and Tehran Metro line 7 Tunnel

Mirhadi, Nima | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43856 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Sadaghiani, Mohammad Hossein
  7. Abstract:
  8. Influence of excavating the Tehran metro line 7 tunnel on surface settlement, stresses and deformations induced in Towhid tunnel is investigated using numerical modeling. Construction of Metro tunnel as the new one must be carried out without imposing any damage to the Towhid tunnel as the existing tunnel. Towhid tunnel is a set of twin tunnels along the Chamran highway in Tehran. The tunnels were constructed using sequential excavation method and lined with cast in place reinforced concrete; on the other side metro line 7 is being constructed using 2 EPB tunnel boring machines and lined with reinforced concrete segments. This research consists of the study of the effects of pillar width, face pressure, metro segment thickness, Towhid tunnel permanent structural lining thickness, soil properties, traffic load and overburden on the nature of the interaction of these tunnels. A set of 25 FEM analysis are done using ABAQUS through full three dimensional (3D) finite element calculations coupled with elasto-plastic material models. On the basis of the calculated results, it is concluded that the driving of the Metro tunnel significantly affects the stresses distribution and deformations on the Towhid support system
  9. Keywords:
  10. Tohid Tunnel ; Line 7 Tehran Metro ; Numerical Modeling ; Parametric Analysis ; Parallel Tunnels Interaction

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