Research Article
Assessment for Thermal Conductivity of Frozen Soil Based on Nonlinear Regression and Support Vector Regression Methods
Table 2
Partial correlation analysis between frozen soil thermal conductivity, dry density, water content, and unfrozen soil thermal conductivity.
| Soil categories | Related variables | Control variables | Unfrozen soil thermal conductivity | Frozen soil thermal conductivity |
| Fine-grained soil | Water content | Dry density | 0.312 | 0.450 | Unfrozen soil thermal conductivity | — | 0.880 | Dry density | Water content | 0.456 | 0.385 | Unfrozen soil thermal conductivity | — | 0.891 |
| Coarse-grained soil | Water content | Dry density | 0.501 | 0.608 | Unfrozen soil thermal conductivity | — | 0.927 | Dry density | Water content | 0.530 | 0.502 | Unfrozen soil thermal conductivity | — | 0.930 |
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