(lb/in.2 )
(kPa)
(lb/in.2 )
(kPa)
6
105
7 x 10 6
5
10
7 x 10
1206 Subgrade
S = 72-75%
γ d = 113.9 lb/ft 3
5
5
7 x 10
10
105.3
σ3
(lb/in.2 )
1
2
w = 16.1%
4
γd = 105 lb/ft3
7
104
7 x 10 4
104
7 x 10 4
20 (lb/in.2 )
20 (lb/in.2)
0
10
0
10
0
70
140 (kPa)
0
70
140 (kPa)
Deviator Stress
Deviator Stress
Figure 12. Resilient modulus vs. deviator stress ap-
Figure 10. Resilient modulus vs. deviator stress ap-
plied to two 1206 subgrade specimens illustrating ef-
plied to a single 1206 subgrade specimen. Data points
fect of dry density. Dashed lines indicate band of 95%
illustrate level of confining stress applied. Dashed
confidence interval.
lines indicate band of 95% confidence interval.
(lb/in.2 )
(kPa)
6
7 x 10 6
10
(lb/in.2 )
(kPa)
1206 Subgrade Unfrozen
7 x 10 6
106
γd = 105 lb/ft3
1206
1232
w = 10.6 %
Class 5
7 x 10 5
10 5
5
105
7 x 10
Class 4
16.1
Class 6
104
Class 3
7 x 10 4
10 4
10 4
7x
19.7
103
7 x 10 3
7 x 10 3
10 3
20 (lb/in.2)
0
10
7 x 10 2
102
100
80
60
40
20
0
70
140 (kPa)
Degree of Saturation (%)
Deviator Stress
Figure 11. Resilient modulus vs. deviator stress ap-
Figure 13. Predicted moduli for all materials in unfro-
plied to three 1206 subgrade specimens illustrating
zen condition.
effect of moisture condition. Dashed lines indicate
band of 95% confidence interval.
A significant discontinuity between thawed 0C
reexamined and findings will be reported in the
and 100% saturated modulus values is shown in
Phase 2 report (Berg in prep.).
Figure 14a. As indicated previously, the differ-
For the granular base and subbase materials,
ence is probably due to miscalibration of the test-
essentially no discontinuity is apparent between
the modulus of the thawed, 0C material and the
ing equipment for the unfrozen data rather than an
actual large difference in resilient modulus values
same material at 100% saturation.
at these points. These data are currently being
17
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