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  A new approach for estimating of settlement curve for twin tunnels

  Increasing demand on infrastructures increases attention to shallow soft ground tunneling methods in urbanized areas. Unlike motorway tunnel, sewerage tunnel and other infrastructure tunnels, generally metro tunnels have to been excavated as twin tunnels and large diameter. Also, metro tunnels have shallow depth. Due to shallow depth, metro tunnels generally have been constructed in weak rocks or weak soils in cities. In the paper, to estimating of transverse settlement curve of twin tunnels, a new equation is proposed by Peck 1969 is modified by multiplying with a disturbance factor (k). The results from proposed estimation equation are compared with results of field observations. The transverse settlement curve values obtained from the proposed equation have good agreement with the actual results for Otogar-Kirazli metro case studies.

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