For the corrected N values in Ex 9.3, determine the (a) relative density, and (b) the angle of friction. Assume the percent of fines in the deposit is less than 5%.
Question 9.4: For the corrected N values in Ex 9.3, determine the (a) rela...
Per Table 9.3 the relative density and \phi are
For N _{60}=42, D_{r}=77 \%, \phi=39^{\circ}
For N _{70}=36, D_{r}=71 \%, \phi=37.5^{\circ}
Per Eq (9.8)
\phi^{\circ}=30+0.15 D_{r} (9.8)
For D_{r}=77 \%, \phi=30+0.15 \times 77=41.5^{\circ}
For D_{r}=71 \%, \phi=30+0.15 \times 71=40.7^{\circ}
| Table 9.3 N_{\text {cor }} \text { and } \phi Related to Relative Density | |||
| N_{\text {cor }} | Compactness | Relative density, D_{r}(\%) | \phi^{\circ} |
| 0-4 | Very loose | 0-15 | <28 |
| 4-10 | Loose | 15-35 | 28-30 |
| 10-30 | Medium | 35-65 | 30-36 |
| 30-50 | Dense | 65-85 | 36-41 |
| >50 | Very Dense | >85 | >41 |
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