permafrost regions

基本解釋

This is the vegetational climate of arctic permafrost regions.
這是北極永凍地區(qū)的植物氣候。
There are 50 years history about subgrade construction technology and the relevant research in the permafrost regions.
目前，針對(duì)級(jí)配碎石力學(xué)性能研究較少，在多年凍土地區(qū)的應(yīng)用研究還是空白。
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年來高原地區(qū)凍融強(qiáng)度（FTI）呈現(xiàn)增大的趨勢(shì)，這在某種程度上表明高原多年凍土區(qū)凍土的穩(wěn)定性發(fā)生了變化；

多年凍土區(qū)
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.
針對(duì)青藏高原多年凍土的特點(diǎn),提出了青藏鐵路多年凍土區(qū)橋梁設(shè)計(jì)主要原則,并對(duì)不同的基礎(chǔ)類型在凍土區(qū)適應(yīng)情況進(jìn)行分析,提出了適應(yīng)高原凍土性質(zhì)的基礎(chǔ)應(yīng)用,最后對(duì)鉆孔灌注樁的承載力,切向凍脹力和基礎(chǔ)沉降量的計(jì)算進(jìn)行介紹。
凍土路基
多年凍土地區(qū)