The disease of subgrade in permafrost region was mainly induced by frost heaving and thawing circulation of frozen soils because of change of seasons.
多年冻土地区路基病害主要由冻土土体在季节变化条件下的冻融循环造成的。
In permafrost regions, the construction of railway should keep the subgrade frozen permanently so as to maintain the stability of the frozen subgrade.
在多年冻土地区修建铁路，为确保冻土路基的稳定，应使路基长期处于冻结状态。
The results are favorable for further understanding the vibration response and train-induced diseases of the subgrade both on permafrost site within thawing interlayers and seasonally frozen site.
本论文的研究成果，有利于加深理解含融化夹层多年冻土场地和季节冻土场地路基列车行驶振动反应与振害问题。
Subgrade construction technology in permafrost regions is a worldwide difficult problem. Nowadays, this problem is still a focus in many countries and regions.
多年冻土地区修筑道路一直是世界性难题，至今仍然是许多国家和地区研究的热点。
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。
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。
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