A New Method to Simulate Stress–Strain Relations from Multiple-Step Loading Triaxial Compression Test Results

    Volume 36, Issue 6 (November 2013)

    ISSN: 0149-6115

    CODEN: GTJOAD

    Published Online: 17 September 2013

    Page Count: 12


    Taheri, A.
    Lecturer, School of Civil, Environmental and Mining Engineering, Univ. of Adelaide,

    Tatsuoka, F.
    Professor, Dept. of Civil Engineering, Tokyo Univ. of Science,

    (Received 6 January 2013; accepted 10 August 2013)

    Abstract

    Multiple-step loading (ML) on a single specimen can be used to determine the peak compressive strengths at different confining pressures (σhS) of cement-mixed gravel (CMG) very similar to those obtained by single-step loading (SL) drained triaxial compression (TC) tests. However, only the unload/reload stress–strain relations at different σhS (except for the primary loading one at the first step) can be obtained from a ML test and the reloading relations become softer with an increase in the negative irreversible axial strain increment that has taken place during respective immediately preceding unloading regimes. This effect gradually decreased during reloading while it totally disappeared once large-scale yielding started. An empirical equation was developed to derive undamaged reloading stress–strain curves (URCs) by removing the damage effects from ML TC test measured reloading curves (MRCs). A new simple method was developed in the framework of proportional rule to simulate primary loading curves (PLCs) at different σhS from the MRCs from a given ML TC test using a correlation factor. A practical procedure for simulation of PLCs in a ML test were established and applied to generate PLCs in a ML test increasing σh and a ML test decreasing σh. The method was validated by comparing the PLCs simulated from the results of a pair of ML tests increasing and decreasing σh with those measured in a set of SL TC tests at different σhS.


    Paper ID: GTJ20130005

    DOI: 10.1520/GTJ20130005

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    Title A New Method to Simulate Stress–Strain Relations from Multiple-Step Loading Triaxial Compression Test Results
    Symposium , 0000-00-00
    Committee D18