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  Ground Water Control by Means of Pervious Backfill Grouting

  Backfill grouting is a specific item defined by the Customers in tunnelling works to obtain different goals. In between these goals, it is worth to consider the ground water control: to release the water table pressure acting against the precast segmental lining, the backfill grouting must be designed as a pervious material. The actual standard grouting mixes (pea gravel with cementitious mortar in rock TBM and bicomponent in pressurized face TBM) are not satisfactory from this point of view. A new specific and custom-designed material have been developed on the base of a Research and Development Contract endorsed by MAPEI Underground Technology Team International, Università degli Studi di Roma "Tor Vergata" - Civil Engineering and Computer Science Department - Tunnelling Engineering Research Centre and Webuild S.p.A. The new material has been tested on specimens reproducing the chamber to be filled in the tunnel, using the same equipment to be provided on the TBM. The results obtained satisfy the requirements set forth in a project under construction.

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