Figure 1.

Figure 2.

Figure 3.

Figure 4.

Figure 5.

Values of the factor of safety for different combinations of root parameters
| Rp |
| FOS |
|---|---|---|
| 1.0 | 0.5 | 1.474 |
| 2.0 | 0.5 | 1.477 |
| 3.0 | 0.5 | 1.481 |
| 3.0 | 1.0 | 1.481 |
| 3.0 | 1.5 | 1.487 |
| 4.0 | 1.5 | 1.494 |
List of soil parameters
| Parameter | Symbol | Value | Unit |
|---|---|---|---|
| Dry unit weight | γd | 12.95 | kN/m3 |
| Poisson's ratio | ν | 0.3 | - |
| Plastic compressibility | λ | 0.145 | - |
| Elastic compressibility | κ | 0.0097 | - |
| Slope of the critical state line | M | 1.0 | - |
| Saturated permeability | ks | 5.00E-06 | m/s |
| Initial void ratio | eo | 0.8 | - |
| Van Genuchten’ sparamters: | |||
| a | 0.7 | kPa | |
| n | 2.16 |