MECHANICS OF GRANULAR MATERIALS
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 |
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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