Research and Application of the Local Differential Freezing Technology in Deep Alluvium

Table 2

Thermophysical parameters of soil layers at various horizons.

Depth	Soil quality	Status	Density (kg·m^3)	Thermal conductivity (J·(ms·°C)^−1)	Specific heat capacity (kJ·(kg·°C)^−1)	Freezing temperature (°C)	Latent heat (kJ·kg^−1)
−100 m	Fine sand	Unfrozen	1935	1.463	1.455	−1.14	44.0
		Frozen		1.784	1.242
−200 m	Sandy clay	Unfrozen	1958	1.415	1.506	−2.10	48.5
		Frozen		1.705	1.325
−300 m	Calcium clay	Unfrozen	1949	1.398	1.517	−2.32	50.5
		Frozen		1.635	1.362
−400 m	Fine silty sand	Unfrozen	2024	1.475	1.372	−1.10	44.0
		Frozen		1.815	1.071
−500 m	Medium-coarse sand	Unfrozen	2055	1.466	1.402	−1.41	44.5
		Frozen		1.796	1.175
−600 m	Mudstone	Unfrozen	2150	1.522	1.257	−2.43	45.5
		Frozen		1.857	1.053