Finite Element Analysis of Natural Thawing Heat Transfer of Artificial Frozen Soil in Shield-Driven Tunnelling

Table 3

Thermal physical parameters for different soil layers.

Soil layers	Thermal conductivity (W/(m·°C))		Specific heat capacity (J/(kg·°C))		Latent heat (×10^8 J/m^3)
	Unfrozen soil	Frozen soil	Unfrozen soil	Frozen soil
Filled soil	1.34	2.12	1506	1250	0.97
Silty clay	1.35	2.22	1547	1330	0.78
Mucky silty clay	1.06	2.10	1717	1321	1.27
Silty sand	1.87	2.50	1473	1083	1.23