多年冻土道路多出现路基沉陷变形和路基路面开裂破坏这两类病害 .根据青藏公路大量调查资料 ,对路基病害与多年冻土类型及其稳定程度、工程历史、路基高度、路基边坡坡向的关系进行了分析 .结果表明 ,多年冻土稳定性差、工程完工时间长、位于路基阳坡面的沉陷和纵裂均较严重 ,而低路堤沉陷与高路堤纵裂均较严重 According to a large number of survey data of Qinghai-Tibet Highway, this paper analyzes the types and stability of permafrost, its stability, engineering history, subgrade height, subgrade slope aspect The results show that the stability of permafrost is poor and the construction completion time is long, the subsidence and longitudinal cracks located on the subgrade sunny slope are more serious, while the low embankment subsidence and high embankment longitudinal cracking are more serious