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Recommended maximum values of the coefficient of variation (Vxmax) for the division into geological layers [8]_
| Geotechnical parameter | Vx max |
|---|---|
| Unit weight, γ (kN/m3) | 0.05 |
| 0.15 |
| Plasticity index, IP (%) | 0.30 |
Example of uniform distribution of measured values confirmed as being part of the same geotechnical layer_
| Measured values of consistency index, Ic (-) | 0.484 | ||||
| 0.488 | 0.512 | ||||
| 0.495 | 0.522 | 0.540 | |||
| 0.507 | 0.538 | 0.557 | 0.568 | ||
| 0.531 | 0.566 | 0.582 | 0.591 | 0.597 | |
| 0.625 | 0.625 | 0.625 | 0.625 | 0.625 | |
| 0.719 | 0.684 | 0.668 | 0.659 | 0.653 | |
| 0.743 | 0.712 | 0.693 | 0.682 | ||
| 0.755 | 0.728 | 0.710 | |||
| 0.762 | 0.738 | ||||
| 0.766 | |||||
| Minimum values, Xmin | 0.531 | 0.507 | 0.495 | 0.488 | 0.484 |
| Maximum values, Xmax | 0.719 | 0.743 | 0.755 | 0.762 | 0.766 |
| Average values, Xm | 0.625 | 0.625 | 0.625 | 0.625 | 0.625 |
| Number of selected values, n | 3 | 5 | 7 | 9 | 11 |
| Standard deviation, sx | 0.094 | 0.094 | 0.094 | 0.094 | 0.094 |
| Coefficient of variation, Vx | 0.15 | 0.15 | 0.15 | 0.15 | 0.15 |
| kn for Vx unknown | 1.69 | 0.96 | 0.73 | 0.61 | 0.54 |
| Xk sup = Xm(1 + kn Vx unknown) | 0.78 | 0.71 | 0.69 | 0.68 | 0.68 |
| Xk inf = Xm(1 - kn Vx unknown) | 0.47 | 0.54 | 0.56 | 0.57 | 0.57 |