青藏公路多年冻土段路基病害分布规律

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.

Distributing Regularities of Subgrade Diseases in Permafrost Section of the Qinghai-Tibetan Highway

In permafrost regions, there often appear settlement in the subgrade and cracks on the pavement; especially appear longitudinal cracks in the subgrade and pavement. It is recognized that distribution of these diseases relates to the stability of permafrost, the road building time, the height of the embankment and the exposure of the embankment. It is found that the settlement and longitudinal cracks are serious when the stability of permafrost is worse, the road building time was long before and the embankment slop is south exposure. The settlement will be more serious if the embankment is low. Meanwhile, the longitudinal crack will be more serious if the embankment is too high