Research on the Changing Law of Tunnel Temperature Field and the Application of Air Curtain System in Cold Regions

Table 2

Material parameters.

Material type	Thickness (m)	Specific heat capacity (j·(kg·°C)^−1)	Density (kg·m^−3)	Thermal conductivity (w·(m·°C)^−1)
Surround rock	20	920	2400	2.4
Lining	0.8	1050	2600	1.74
Air	−	1005	1.2	0.026