Soil Conditioning and Ground Monitoring for Shield Tunnelling

Claudio Oggeri, Raffaele Vinai

    Research output: Contribution to journalArticlepeer-review

    1316 Downloads (Pure)


    Soil conditioning consists of mixing and remolding the natural material during the mechanical excavation of tunnels, generally at low depth, with additives, in order to obtain suitable properties of plasticity and consistency for the excavated material, so becoming able to apply a counterpressure against natural earth pressure and groundwater flow towards the excavation chamber. The assessment and the control of the soil parameters and of machine performance are fundamental for a regular and safe excavation, also with regards to surface stability. This paper mainly focus on testing approach aimed to the proper soil conditioning with EPB shields, whose results have been validated at real scale. The influence of the water content and the amount of conditioning foam has been studied by the Authors. A proper definition of conditioning parameters can allow to extend the application field of Earth Pressure Balance (EPB) tunnel machines to various grain soil distribution, even in weak rock formations (e.g. siltstone or flysch). Importance of conditioning is reflected also on the possibility of a proper spoil disposal or better for its reuse.
    Original languageEnglish
    Pages (from-to)2-14
    Number of pages13
    JournalRevista Minelor
    Issue number4/2012
    Publication statusPublished - 2012


    • mechanized tunnelling
    • soil conditioning
    • EPB shield
    • spoil reuse


    Dive into the research topics of 'Soil Conditioning and Ground Monitoring for Shield Tunnelling'. Together they form a unique fingerprint.

    Cite this