Inflection Point Method to Estimate ch From Radial Consolidation Tests with Peripheral Drain

    Volume 36, Issue 5 (September 2013)

    ISSN: 0149-6115

    CODEN: GTJOAD

    Published Online: 22 July 2013

    Page Count: 6


    Ganesalingam, Dhanya
    Ph.D. Student, School of Engineering and Physical Sciences, James Cook Univ., Townsville, Queensland

    Sivakugan, Nagaratnam
    Associate Professor, School of Engineering and Physical Sciences, James Cook Univ., Townsville, Queensland

    Read, Wayne
    Associate Professor, School of Engineering and Physical Sciences, James Cook Univ., Townsville, Queensland

    (Received 29 October 2012; accepted 27 May 2013)

    Abstract

    Horizontal coefficient of consolidation ch is a key parameter in the design of vertical drains and the following consolidation analysis of a soil layer. There are graphical and non-graphical methods available to estimate ch from laboratory radial consolidation tests with a central drain. Currently, the consolidation tests with peripheral drains have to be analysed through a curve fitting method for determining ch. In this technical note, a non-graphical inflection point method is proposed for determining ch for an oedometer test with peripheral drainage, based on the characteristic feature observed when the gradient of the theoretical Ur –log Tr relationship was plotted against Tr. The proposed method is validated through a series of consolidation tests on two reconstituted dredged clay specimens, tested in an oedometer subjected to radial drainage with peripheral drains. The consolidation settlements predicted from the proposed method, for the two different clays, were in excellent agreement with those measured in the oedometer. The proposed method will be a very valuable tool in the analysis of radial consolidation data when the drains are peripheral.


    Paper ID: GTJ20120203

    DOI: 10.1520/GTJ20120203

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    Author
    Title Inflection Point Method to Estimate ch From Radial Consolidation Tests with Peripheral Drain
    Symposium , 0000-00-00
    Committee D18