5Sheppard M T, Kay B D, Loch J P G. Development and testing of a computer model for heat and mass flow in freezing soils [ C ]//Pro- ceedings of 3rd international conference on permafrost, national re- search council of canada, Ottawa, Ont. , 1978:76 - 81.
6Kay B D, Greenevelt P H. On the interaction of water and heat transport in frozen and unfrozen soil [ J ]. soil science society of a- merica, 1974,38:395 - 400.
7Tayor G S, Luthin J N. A model for coupled heat and moisture transfer during soil freezing [ J ]. Canadian Geotechhnical Journal, 1978,15 ..548 - 555.
