Analysis on Cooling Effect of Crushed-Rocks Embankment of Qinghai-Tibet High-Grade Road

Table 1

Thermal parameters of various materials in and beneath the embankment.

Physical parameters	Heat conduction coefficient for frozen soil; (W/(m·°C))	Heat capacity for frozen soil; (J/(m^3·°C))	Heat conduction coefficient for unfrozen soil; (W/(m·°C))	Heat capacity for unfrozen soil; (J/(m^3·°C))	Latent heat; (J/m^3)
Ventilation duct	1.54	2.016 × 10^6	1.54	2.016 × 10^6	0
Crushed-rocks	0.39	1.015 × 10^6	0.39	1.015 × 10^6	0
Gravel fill	1.98	1.913 × 10^6	1.92	2.227 × 10^6	2.04 × 10^7
Silty clay	1.35	1.879 × 10^6	1.13	2.357 × 10^6	6.03 × 10^7
Weathered mudstone	1.82	1.846 × 10^6	1.48	2.099 × 10^6	3.77 × 10^7