Volume 35, Issue 6 (November 2012)

    Centrifuge Modeling of Seismic Loading on Tunnels in Sand

    (Received 23 September 2011; accepted 11 June 2012)

    Published Online: 2012

    CODEN: GTJOAD

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    Abstract

    The purpose of the work is to provide an experimental benchmark on the seismic behavior of tunnels, with the final aim of calibrating numerical and analytical design methods. A series of plane-strain centrifuge tests with dynamic loading on a model tunnel was, therefore, carried out at the Schofield Centre of the Cambridge University Engineering Department (CUED). Four samples of dry uniform fine sand were prepared at two different densities, in which an aluminum-alloy tube was installed at two different depths. The tube was instrumented with strain gauges to measure hoop forces and bending moments at significant locations. To monitor the amplification of ground motion from the base to the surface, vertical arrays of accelerometers were placed in the soil model and along the box. The instrumentation also included linear variable differential transformers (LVDTs) that measured the soil surface settlement during all test phases. The test procedure and the results are described in this paper, showing the evolution of both accelerations and internal forces along the tunnel lining during the model earthquakes.


    Author Information:

    Lanzano, Giovanni
    Research Assistant, Univ. of Molise, Campobasso,

    Bilotta, Emilio
    Assistant Professor, Univ. of Naples Federico II, Naples,

    Russo, Gianpiero
    Associate Professor, Univ. of Naples Federico II, Naples,

    Silvestri, Francesco
    Professor, Univ. of Naples Federico II, Naples,

    Madabhushi, S. P. Gopal
    Reader, Univ. of Cambridge, CB2,


    Stock #: GTJ104348

    ISSN: 0149-6115

    DOI: 10.1520/GTJ104348

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    Author
    Title Centrifuge Modeling of Seismic Loading on Tunnels in Sand
    Symposium , 0000-00-00
    Committee D18