permafrost regions

基本解释

This is the vegetational climate of arctic permafrost regions.
这是北极永冻地区的植物气候。
There are 50 years history about subgrade construction technology and the relevant research in the permafrost regions.
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。
In the past 30 years, the values of freeze-thaw intensity (FTI) exhibited an increasing trend, which indicates that the stability of frozen ground has changed to some extent in the permafrost regions.
近30年来高原地区冻融强度（FTI）呈现增大的趋势，这在某种程度上表明高原多年冻土区冻土的稳定性发生了变化；

多年冻土区
In this paper, the main principles in bridge design of the Qinghai-Tibet Railway, a railway passes through permafrost regions, are introduces. The adaptability and application of some foundations in permafrost regions are also analyzed.
针对青藏高原多年冻土的特点,提出了青藏铁路多年冻土区桥梁设计主要原则,并对不同的基础类型在冻土区适应情况进行分析,提出了适应高原冻土性质的基础应用,最后对钻孔灌注桩的承载力,切向冻胀力和基础沉降量的计算进行介绍。
冻土路基
多年冻土地区