Table 3. Result of soil bulk density using soil penetrometer.
| Soil depth (cm) | Soil hardness (kgf/cm2) |
| Normal slope | Landcreep upper soil(upper) ⓵ | Landcreep upper soil(Bottom) ⓶ | Upeer tension crack in the middle of the road ⓷ | Bottom tension crack in the middle of the road ⓸ | Tension crack in the lower part of the slope ⓹ | Ground water spill area in the lower part of the slope ⓺ |
| 0 | 2.3 | 6.0 | 4.0 | 4.2 | 4.0 | 2.0 | 2.0 |
| 5 | 2.3 | 6.0 | 4.0 | 4.2 | 4.0 | 2.0 | 2.0 |
| 10 | 2.3 | 6.0 | 4.0 | 4.2 | 4.0 | 2.0 | 2.0 |
| 15 | 2.3 (13cm) | 6.0 (15cm) | 4.0 | 4.2 | 4.0 (12cm) | 2.0 | 2.0 |
| 20 | | | 4.0 | 4.2 | | 2.0 | 2.0 |
| 25 | | | 4.0 | 4.2 | | 2.0 | 2.0 |
| 30 | | | 4.0 | 4.2 | | 2.0 | 2.0 |
| 40 | | | 4.0 | 4.2 | | 2.2 | 2.0 |
| 50 | | | 4.0 | 4.2 (42cm) | | 2.4 | 2.0 |
| 60 | | | 4.0 | | | 2.5 | 2.5 |
| 70 | | | 4.0 | | | 2.7 | 2.5 |
| 80 | | | 4.0 | | | 2.7 (74cm) | 2.7 (79cm) |
| 90 | | | 4.0 (85cm) | | | | |