Assessment for Thermal Conductivity of Frozen Soil Based on Nonlinear Regression and Support Vector Regression Methods

Table 3

Ternary fitting result of frozen soil thermal conductivity for 7 typical soils in the QTEC.

Soil type	Fitting coefficients				R^2
	a	b	c	d
Silty clay	−0.703	1.291	0.238	0.007	0.759
Silt	−1.358	1.283	0.424	0.248	0.792
Weathered rock	−0.102	1.370	0.183	−0.854	0.895
Fine sand	−0.220	1.290	0.146	−0.429	0.908
Gravel sand	−0.617	1.272	0.254	−0.138	0.933
Boulder	−1.257	1.049	0.497	0.702	0.865
Breccia	−1.282	0.884	0.459	1.239	0.78