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

    Volume 39, Issue 6 (November 2016)

    Factors Affecting Steady State Locus in Triaxial Tests

    (Received 26 May 2015; accepted 19 May 2016)

    Published Online: 09 September 2016

    CODEN: GTJODJ

      Format Pages Price  
    PDF (7.28 MB) 23 $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

    Models based on critical state soil mechanics (“CSSM”) require careful calibration of laboratory parameters in order to ensure accurate prediction of the behavior of soil under in situ conditions. This paper presented research on the testing of two distinct materials, a silt and a silty sand. Several triaxial tests were conducted under drained and undrained conditions, with low to very high confining pressures. Distinct mechanical responses were observed: some samples liquefied, some softened, and others hardened when loaded under undrained conditions. The degree of saturation, the induced anisotropy and the induced stress-path were found to influence the state limits between these distinct behaviors. This affected the steady state line (“SSL”) position defined by specimens showing strain softening in the experiment. Furthermore, the “critical state line” was only achieved when the specimens experienced strain hardening despite the stress-path during shear and the initial state conditions. Therefore, as these factors can impact the steady state line (SSL) position, it is essential when assessing the geomechanical behavior of the soil that these factors are monitored and controlled under laboratory conditions according to the in situ state condition and stress-path during shear. In the future, constitutive models have therefore to be adapted in order to determine the influence of these conditioning factors in the ultimate CSSM reference lines positions.

    Author Information:

    Soares, M.
    CONSTRUCT-GEO, Faculty of Engineering (FEUP), Univ. of Porto, Porto,

    Fonseca, A. Viana da
    CONSTRUCT-GEO, Faculty of Engineering (FEUP), Univ. of Porto, Porto,


    Stock #: GTJ20150228

    ISSN:0149-6115

    DOI: 10.1520/GTJ20150228

    Author
    Title Factors Affecting Steady State Locus in Triaxial Tests
    Symposium ,
    Committee D18