Abstract: In order to analyze the impact of permafrost degradation on subgrade stabilization in northeast permafrost areas with climate warming, supposed the annual grow thrate of temperature was 0.05, the maximum seasonal thawing depth change of permafrost was calculated by finite element analysis software ANSYS based on different surface coverage and different ice content; the settlement of soil with different amount of ice was calculated through thawing settlement coefficient. The results demonstrated that when there was climate warming, the settlement of soil with greater ice content was greater than that with minorice content; natural turf and peat could prevent perm afrost from degradating; human activities would worsen the soil settlement, thus causing serious in fluence on embankment stability of highway and railway engineering.

Key words: Climate warming, permafrost, sub grade, thawing settlement coefficient, settlement

摘要： 为了分析在气温升高的状况下冻土退化对东北多年冻土地区路基稳定性的影响,假设气温年增长率为 0.05??,通过ANSYS有限元软件计算了不同地表状况和不同含冰量情况下,多年冻土最大季节融化深度变化,根 据不同土质、不同含冰量的融沉系数,计算得到不同含冰量冻土的沉降量。结果表明:在气温逐年升高的状况下, 含冰量大的土层沉降量大于含冰量小的土层；天然草皮泥炭对多年冻土的退化有一定的保护作用；人为活动的影 响会使沉降量增加,从而对公路及铁路工程路基稳定性产生严重影响。

关键词: 气温升高, 多年冻土, 路基, 融沉系数, 沉降量