With the increase of train speed, the frosthazard of subgrade engineering in seasonally frozen soil becomes more and more serious.
随着列车速度的不断提高，季节冻土区路基工程的冻胀问题也越来越突出。
2
Meantime there are two kinds of weather of the cold wave, one of them is expressed as rainy or snowy day near the front, another is successive clear days result in severe frosthazard.