| SPT values | Consistency of soil | Angle of internal friction |
| 0 - 4 | Very loose | < 30° |
| 5 - 10 | loose | 30 - 35° |
| 11 - 30 | Medium dense | 35 - 38° |
| 31 - 50 | Dense | 38 - 41° |
| > 50 | Very Dense | 41 – 44° |
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