Liquefaction Study of Heterogeneous Sand: Centrifuge

    Volume 34, Issue 3 (May 2011)

    ISSN: 0149-6115

    CODEN: GTJOAD

    Published Online: 7 February 2011

    Page Count: 11


    Chakrabortty, Pradipta
    Civil Engineering Group, Birla Institute of Technologies and Science, Pilani,

    Popescu, Radu
    URS, Washington Division, Princeton, NJ

    Phillips, Ryan
    C-CORE, NL

    Chakrabortty, Pradipta
    Civil Engineering Group, Birla Institute of Technologies and Science, Pilani,

    Popescu, Radu
    URS, Washington Division, Princeton, NJ

    Phillips, Ryan
    C-CORE, NL

    (Received 15 December 2009; accepted 17 March 2010)

    (Received 15 December 2009; accepted 17 March 2010)

    Abstract

    From past numerical research and small scale laboratory tests, it has been observed that more excess pore water pressure (EPWP) is generated during earthquakes in a heterogeneous sand deposit than in the corresponding homogeneous sand with relative density equal to the average relative density of the heterogeneous sand. This interesting phenomenon is investigated here in large scale experiments using geotechnical centrifuge modeling techniques. A series of liquefaction tests have been conducted at C-CORE’s geotechnical centrifuge facility: Two on variable sand and one on uniform sand deposits. A one level frame structure resting on two strip footings was also placed on that sand deposit to study the effect of soil variability on building foundations. Experimental results such as accelerations, EPWPs and settlements were monitored and measured throughout the tests. Recorded results support the conclusion of previous research that more EPWP is generated in heterogeneous sand deposits than in the corresponding homogeneous sand. The liquefaction mechanism of heterogeneous sands leading to this phenomenon is discussed in this paper.


    Paper ID: GTJ102925

    DOI: 10.1520/GTJ102925

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    Author
    Title Liquefaction Study of Heterogeneous Sand: Centrifuge
    Symposium , 0000-00-00
    Committee D18