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  The underpass of the two M5 subway lines at cross point with the four underground lines of Domodossola railway station

  The tunnels of the Milan Metro 5 are located at a short distance from the rails of Domodossola railway station because it was necessary to maintain the elevation of the tracks and to avoid that the tunnel section would be totally submerged by the water table. The crown excavation reinforcing, realized by means of double overlapping sub horizontal jet grouting columns and forepoling, resulted the proper solution. The inverted arch, under the water table, was grouted with cement and chemical mix through manchette pipes. Tracks uplifts, during the jetting operations and successive settlements, were monitored and they were contained within the limits imposed by the conductor, Ferrovie Nord Milano. The success was obtained by several important factors among which the monitoring of the rails and of the station's structures, the preliminary tests to identify the most proper jet parameters, prewashing and the control of the spoil return flow.

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