Determination of the Deformation Characteristics of a Jet-Grouted Shallow Tunnel in Alluvial Deposits by Means of In-Situ Measurements and Back Analysis

by Bastian Otto, Solexperts, Schwerzenbach, Switzerland,
Arno Thut, Solexperts, Schwerzenbach, Switzerland,

Document Type: Proceeding Paper

Part of: Geotechnical Engineering Congress?1991


The deformation characteristics of a jet-grouted shallow tunnel in alluvial deposits are investigated. An intensive in-situ measuring program accompanied each of the various excavation phases. A measuring concept consisting of linewise and far-field observations is introduced. Results of Dilatometer, Sliding Micrometer, surface settlements and convergence measurements are presented and discussed. The deformation characteristics are evaluated using numerical back analysis. This showed that linewise and far-field observations are a suitable comparative tool for back analysis. The effectiveness of the jet-grouted vault and shotcrete steel arch lining as a support system is evaluated.

Subject Headings: Tunnels | Jet grouting | Field tests | Deformation (mechanics) | Alluvium | Failure analysis | Shotcrete

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