PROJECT: MASHHAD URBAN RAILWAY LINE 2
| Description: | Detailed engineering of a bored tunnel |
| Client: | Mashhad Urban Railway Line 2 Project |
| Contact person: | ir. M.H.A. Brugman (M.Sc.) |
| Background information: | Article Cobouw 2009-11-14 (Dutch) |
| Article Felsbau magazin 2009 Vol. 5/6 (German) |
The Mashhad Urban Railway Line 2 project comprises the construction of the second line of the envisioned metro network that will facilitate passenger transport in the city of Mashhad, Iran. The line will be constructed in 2010 and 2011.
The metro line will be situated under street level in a tunnel running in a Northeast - Southwest direction.
The metro line will connect a total of 12 stations, and will be linked with the existing metro line 1 and the future lines 3 and 4 as well as with the national railway line of Iran. The total length of line 2 is approximately 14,3 km of which approximately 10,8 km will be constructed using a tunnel boring machine (TBM).
One twin-track tunnel-tube is to be drilled with an outer diameter of 9,430 mm. The tunnel-tube will be bored using a TBM with an earth pressure balance shield (EPB). The tunnel will be bored through stiff to hard clay with, mainly in the south west section of the line, lenses of sand and coarse to very coarse gravel with boulders.
In March 2009, the total engineering design of the bored tunnel has been acquired by Arthe Civil & Structure Int.
Engineering and consultancy works executed by Arthe Civil & Structure Int. include the following subjects:
- Review and evaluation of available geotechnical investigations, and defining the required additional investigations;
- Design and evaluation of TBM & consultancy services for the TBM acquisition;
- Structural design and engineering of the tunnel lining;
- Evaluation of settlements and influence of the boring process on the surroundings;
- Tunnel stability analyses and the description of measures;
- Design and engineering of tunnel boring processes and procedures;
- Evaluation and selection of construction materials.
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