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  Excavation of the Evouettes Tunnel - Lessons Learned from a jet grouting soil

  The Evouettes Tunnel is a bidirectional, single-tube, 657 m long road tunnel under construction in Wallis, Switzerland. The encountered ground conditions, comprising loose material, makes the implementation of a classical pipe umbrella stabilization method very difficult. The decision was taken to design and specify a sub horizontal jet-grouting umbrella, which allows for full-face excavation, thanks to the presence of 45 jet columns around the excavation perimeter and 13 in the face itself. This advance stabilization method requires a big investment in terms of time and costs, and continuous adjustment of the injection parameters. The jet-grouting technique remains unusual for sub horizontal tunnel support. This is why the lessons learned from such a project have to be shared among the tunnelling community and are necessary to establish a design methodology in terms of injection parameters, with the aim to optimize the obtained results and to mitigate the potential drawbacks.

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