MECHANICS OF GRANULAR MATERIALS

Terrestrial Investigation


  • Ground CT Data
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  • Triaxial experiments have also been performed in the terrestrial (1-g) environment. Below is a table of properties obtained from several tests. Each test is listed with name, relative density (DR), confining pressure at peak stress ratio ( s3), peak friction angle (fmax), friction angle at constant volume (f cv), and dilatancy angle (y).

    A graphical comparison with data obtained in microgravity is available in the MGM I and II results section.


    Test Name Dr s3 fmax f cv y
    SS26 85.0 2.00 44.9 29.1 20.9
    SS28 85.0 3.17 46.2 37.8 21.4
    SS29 85.0 2.99 48.4 31.9 23.2
    SS32 84.3 3.1 49.3 35.8 24.4
    B2 88.5 11.2 44.6 37.9 15.2
    B3 89.1 11.3 44.8 38.3 17.0
    B4 91.3 11.5 44.5 37.1 19.0
    B5 86.1 34.7 44.2 36.4 16.3
    B6 87.2 34.5 44.8 37.0 15.4
    B7 83.6 34.5 43.5 36.9 13.3
    B8 87.5 68.17 42.4 35.5 15.4
    B9 90.8 69.4 42.3 35.3 15.9
    B10 91.3 69.6 42.4 34.9 16.9
    KSC5 82.3 3.37 48.9 n/a 24.4
    KSC8 80.7 3.36 50.9 n/a 23.9
    KSC12 78.8 3.36 51.3 40.4 23.2
    KSC16 82.3 3.26 51.6 40.6 24.0
    NC1 79.7 3.34 50.7 36.5 22.6
    NC2 78.7 3.30 49.7 38.4 22.7
    NC3 77.8 3.25 49.8 37.2 23.6
    B22 49.0 1.30 41.8 33.0 14.2
    B23 65.0 1.30 45.5 34.0 17.3
    B24 79.0 1.30 46.6 38.8 17.2
    SS33 73.2 3.33 49.6 37.0 23.4
    SS34 76.7 2.48 50.9 36.5 23.1
    SS35 76.8 2.55 48.8 33.5 22.9
    SS36 66.5 2.12 44.7 32.0 22.3
    K1 66.5 70.02 42.1 35.3 16.1
    K2 67.9 69.66 42.7 34.9 16.0
    K3 67.1 69.83 41.9 34.4 13.1
    K4 67.8 34.24 44.1 35.8 16.7
    K5 66.6 34.14 43.7 36.8 16.6
    K6 67.1 34.34 44.4 37.3 16.2
    K7 66.2 13.01 47.9 41.6 18.0
    K8 67.4 13.10 48.2 41.1 18.5
    K9 65.7 13.10 46.9 40.3 18.7

    Terresrial CT Scans

    To further investigate the formation of shear bands in the specimens, four specimens were built and compressed in the 1g environment, with final compression ranging from 4.6% up to 16.1% axial strain. The results give a type of "time-lapse" image of how shear bands are formed. As seen in the 4.6% axial strain specimen, there is no distinct structure within. However, a structure begins to form between 4.6% to 9.2% axial strain, and continues to increase in number and distinctness of shear bands in the 9.2%, 12.0%, and 16.1% axial strain specimens.

        4.6% axial strain specimen, 1.30 kPa
        9.2% axial strain specimen, 1.30 kPa
        12.0% axial strain specimen, 1.30 kPa
        16.1% axial strain specimen, 1.30 kPa


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