You are being redirected because this document is part of your ASTM Compass® subscription.
    This document is part of your ASTM Compass® subscription.

    Volume 40, Issue 5 (September 2017)

    Measurement of Lateral Stress and Friction in Rockfill Oedometer Tests Enabling the Analysis of the Experimental Results in the p′-q Space

    (Received 25 July 2016; accepted 24 February 2017)

    Published Online: 2017

    CODEN: GTJODJ

      Format Pages Price  
    PDF (2.13 MB) 11 $25   ADD TO CART

    Cite this document

    X Add email address send
    X
      .RIS For RefWorks, EndNote, ProCite, Reference Manager, Zoteo, and many others.   .DOCX For Microsoft Word



    Abstract

    The oedometer is one of the simplest and most reliable laboratory tests. Its main drawback is that stress state is not fully known. Over the years, a number of enhancements were intended to overcome this limitation. This work presents the development of a large size oedometer for testing gravels made of crushed rock under varying moisture conditions. Load application is done by air pressure acting on the upper end of the specimen (Rowe type oedometer), and the lateral stress is measured using a strain-gage-instrumented oedometer ring. Special features were included in the ring geometry for enhancing the lateral stress measurement signal, while keeping the deformation of the ring to acceptably low levels. The lateral friction between specimen and oedometer wall is computed as the difference between the applied load and the reaction force at the specimen base, measured by means of three load cells. The performance of the oedometer is studied by means of a finite element model of the oedometer ring. The deformability of the ring and the production of spurious readings of lateral stress due to varying operation conditions are evaluated and found to be satisfactorily low. Some experimental results on a rockfill type material are presented. The lateral stress and friction data are analysed in terms of the lateral stress ratio and in the p′-q space. The observed behavior is found to be stress– and suction–dependent. The results are consistent with triaxial tests of the same material published elsewhere.

    Author Information:

    Oldecop, L. A.
    Earthquake Engineering Institute (IDIA), Universidad Nacional de San Juan,

    Alonso, E. E.
    Department of Geotechnical Engineering and Geosciences, Universitat Politecnica de Catalunya, Barcelona,


    Stock #: GTJ20160038

    ISSN:0149-6115

    DOI: 10.1520/GTJ20160038

    Author
    Title Measurement of Lateral Stress and Friction in Rockfill Oedometer Tests Enabling the Analysis of the Experimental Results in the p′-q Space
    Symposium ,
    Committee D18