Florence HSR tunnel underpasses the densely urbanized area of Florence in Italy. TBM/EPB excavation is executed in soft soil and, in particular next to the southern portal, under a shallow cover: 6m to 8m of sand and clay separate the tunnel from the foundations of 2 masonry buildings and a steel bridge. Compensation grouting resulted as the best approach to preserve structures serviceability. The paper describes compensation grouting activities performed, from design to execution. The monitoring and data processing system is also detailed. Together with appropriate real-time post-processing strategies, it allowed a punctual control and guidance of the grouting activities.
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