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    Volume 42, Issue 6 (November 2019)

    Development and Application of a New-Type Apparatus for K0 Test of Soil

    (Received 14 April 2017; accepted 1 August 2018)

    Published Online: 01 November 2018

    CODEN: GTJODJ

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    Abstract

    Most of the existing methods that are used to measure the coefficient of earth pressure at rest (K0) are not suitable for coarse granular soil because of the rubber membrane; therefore, an apparatus to measure the K0 of coarse-grained soil should be developed. The aim of this article is to introduce a new-type apparatus for measuring the K0 of coarse granular soil. A method for correcting the effect of the side wall friction is proposed to ensure test accuracy. To compare it with the conventional water-bag type K0 oedometer, tests on a dry sand using both the new apparatus and the conventional K0 oedometer were performed. Results proved that the newly developed apparatus is more accurate than the water-bag type K0 oedometer. Of importance, some tests of coarse granular soils were taken for application of the apparatus. The results show that the K0 of the coarse granular soil is almost a constant value during the loading steps but changes greatly during the unloading steps. In addition, an equation is proposed to predict K0 changing with the overconsolidation ratio during unloading. The K0 of coarse granular soil decreases when the density increases, and the influence of the gradation on K0 is evident.

    Author Information:

    Zhu, Jun-Gao
    Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing,

    Jiangsu Research Center for Geotechnical Engineering Technology, Hohai University, Nanjing,

    Lu, Yang-Yang
    Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing,

    Jiangsu Research Center for Geotechnical Engineering Technology, Hohai University, Nanjing,

    Jiang, Ming-Jie
    Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing,

    Jiangsu Research Center for Geotechnical Engineering Technology, Hohai University, Nanjing,

    Jin, Wei
    China Power Construction Group Chengdu Survey and Design Institute Limited, Chengdou, Sichuan


    Stock #: GTJ20180091

    ISSN:0149-6115

    DOI: 10.1520/GTJ20180091

    Author
    Title Development and Application of a New-Type Apparatus for K0 Test of Soil
    Symposium ,
    Committee E41