如果冰常年不化，这种冰～土混合物被称为“多年冻土”（perennially frozen soil）。显而易见，孔隙水是一个状态变量，可以随着温度处于水蒸气、液态水或固态冰等状态。
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Because of unique climatic condition and geological condition in perennially frozen soil zone, structural design of asphalt pavement in this area has its particularity.
多年冻土地区独特的气候条件和地质条件决定了该地区沥青路面结构设计的特殊性。
At present, the study on mechanical behavior of graded broken stone is very limited and there is no any study of its application especially in perennially frozen soil zone.
目前，针对级配碎石力学性能研究较少，在多年冻土地区的应用研究还是空白。
The asphalt mixture's crack resistance at low temperature is one of the key pavement performances in perennially frozen soil zone, and aging procedure has important effect on it.
沥青混合料的低温抗裂性能是多年冻土地区沥青路面的关键路用性能之一，老化对其有着重要影响。
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