MASHHAD URBAN RAILWAY LINE 2: STRUCTURAL DESIGN
| Description: | Design and engineering of the Tunnel Lining |
| Client: | Mashhad Urban Railway Line 2 Project |
| Contact person: | ir. M.H.A. Brugman (M.Sc.) |
In the Iranian city of Mashhad, a metro system is being constructed. Arthe Civil & Structure has performed the design and engineering of the bored section of the tunnel for the second metro line, including the design and structural analysis of the concrete tunnel lining. The twin railway track tunnel has an external diameter of 9,1 m and the length of the bored section amounts to 10,8 km.
The ring and segment geometry design comprised the following elements:
- 7 segments + keystone per ring;
- TBM jack plate centres at ¼ and ¾ of the segment;
- Segment thickness of 350 mm;
- Universal tunnel ring with a length of 1.5 m and a tapering allowing for curves with R = 250 m;
- Skewed segment sides, facilitating segment installation;
- 4 plastic dowels per segment, connecting the adjacent tunnel rings;
- Single gasket line, for water sealing;
- Allowable casting tolerances;
- Concrete mix design for the segments.
The structural analysis of the lining contained the following items:
- Preliminary structural segment design;
- Structural segment design, including:
- Static analysis in transversal direction (ring action);
- Static analysis in longitudinal direction (beam action);
- Earth quake loading: quasi static and dynamic analysis;
- Segments under thrust jack loadings;
- Actions on segment during casting, handling, stacking and storage;
- Pre-stressing loads near the shafts and connections.
The results of the design and engineering activities have been laid down in final segment drawings and reinforcement drawings.
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