Soil Conditioning and Ground Monitoring for Shield Tunnelling

Claudio Oggeri, Raffaele Vinai

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    Abstract

    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
    Volume18
    Issue number4/2012
    Publication statusPublished - 2012

    Keywords

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

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  • Cite this

    Oggeri, C., & Vinai, R. (2012). Soil Conditioning and Ground Monitoring for Shield Tunnelling. Revista Minelor, 18(4/2012), 2-14.