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  Evaluation of Long-term Settlement Induced by Shield Tunnelling Case study: Tehran Metro Line 7 (East-West Lot)

  A 12 km long tunnel of East-West lot of Tehran metro line 7 is being constructed by a 9.164 m diameter Earth Pressure Balance Tunnel Boring Machine (EPB-TBM) through an old heavily built-up and congested area of the southern part of the city. General information about the project was presented in Table 1. This tunnel passes beneath buildings, different underground structures such as water conveyance tunnels, other metro lines and a lot of unforeseeable old underground waterways called as Qanat and other abandoned man-made cavities. These unusual circumstances caused to the occurrence of some collapses, building damages and other construction problems alongside the tunnel route (Geranmayeh et al., 2012, Foroughi et al., 2012). Some of these challenges cause the surface settlement to be prolonged for long period of times. Hence, it is needed to continuing the ground level monitoring in some leveling points more than 7 months after the passing of the shield. This leads to the obtaining of valuable results from interpretation of long-term settlements due to shield tunneling. Boring diameter 9.164 m Total length 12200 m Precast segmental lining: Outer diameter 8,85 m Inner diameter 8,15 m Type Universal ring Number of pieces 6 + 1 key + 1 invert Thickness 35 cm Length 1.5 m

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