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  Copenhagen Cityringen Metro: EPB-TBM head pressure definition

  The paper describes a relevant design aspect for the Copenhagen Cityringen Metro Line, which consists of two single-track tunnels, each approximately 16 km in length, 17 underground stations, 3 construction and ventilation shafts and an access ramp. The tunnels, 5.8 m in diameter, are excavated by using four EPB TBMs; the tunnel lining is composed by 5+1 r.c. segments, 1.4 m long and 0.3 m thick. Technological aspects and general problem solving are discussed and described. In detail, the effect of the design choices about the definition of the correct TBM confinement pressure on the tunnel face (driving strategy, A.DE.CO.-RS approach) is analysed, by comparing settlement previsions and satisfactory monitoring results.

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