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  Optimum stage construction of Tehran metro lines 6 and 7 in regard to intersection of these lines

  The phase 1 of line 6 of Tehran metro with 11700km connects the South East to the North East of the metropolitan. At 6526km, this line underpasses the line 7 so that there is 1.67m vertical distance between the floor of line 7 and the crown of line 6. In this paper, the intersection has been modeled using the 2D finite element method. A model close to reality has been constructed to study the subsidence at the ground surface due to passing of self-drilling machines. All the stages of drilling including injection of grout, cone shape of shield and stage construction have been modeled. Also, sequence of machine passes and its effect on the surface subsidence is studied and the results are compared with approximate analytical methods. The results of current study show that the first scenario (first line 6 and then line 7) results into a more stable condition for the intersection. However, in the second scenario, the ground subsidence is still within the allowable range.

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