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。
The disease of subgrade in permafrost region was mainly induced by frost heaving and thawing circulation of frozen soils because of change of seasons.
这些因素都是通过影响地温场的变化而对多年冻土施加作用效果。
The factors above always give effect to the permafrost by changing the ground temperature field.
气候变化和人类活动加剧，致使我国东北地区多年冻土退化严重。
The climate change and the intensifying human activity cause the permafrost degradation in Northeast China.
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