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  Warsaw metro Line 2: TBM Excavation in difficult condition: The underpass of Vistula river

  the central stretch of the Warsaw Metro Line 2 has an extension of 6,3 km with 7 stations. The paper describes the underpass of Vistula River which has been the most critical of several significant underpasses dealt during the excavation with the TBM. The collected geotechnical data and bathymetric surveys have been useful to define the TBM parameters according the A.DE.CO-RS design approach. In addition the soil masses behavior during excavation has been evaluated by back analyses carried out on the results collected in real time in the tunnel sections close to the river. During the excavation continuous check of the machinery excavation parameters showed the respect of the design expectations. The underpass of Vistula River has been characterized by a minimum overburden of 7 m and a total excavation length of 300 m. The TBM’s excavation has been realized in safety conditions, without technical problems and respecting high rate of production.

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