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

Table 1

Statistical distribution of various soil specimens.

Soil type		Numbers	Proportion (%)	Sampling depth (m)
				≤1	1∼5	5∼10	10∼20	≥20
Fine-grained soil	Clay	24	3.94	1	6	3	9	5
	Silty clay	202	33.17	10	63	40	69	20
	Silt	52	8.54	6	23	10	8	5
	Weathered slate	10	1.64	2	4	1	2	1
	Weathered phyllite	29	4.76	0	7	10	10	2
	Weathered sandstone	6	0.99	0	4	0	1	1
	Weathered marl	5	0.82	0	1	2	1	1
	Weathered mudstone	23	3.78	0	7	5	11	0
Coarse-grained soil	Silty sand	23	3.78	1	10	4	6	2
	Fine sand	49	8.05	14	19	9	2	5
	Medium sand	5	0.82	0	1	3	1	0
	Coarse sand	3	0.49	0	3	0	0	0
	Gravel sand	45	7.39	5	28	5	5	2
	Boulder	49	8.05	3	31	5	5	5
	Breccia	55	9.03	7	32	6	8	2
	Gravel + pebble	10	1.64	0	4	1	3	2
	Gravel soil	19	3.12	1	12	1	5	0