Abstract: In order to study the deformation law of embankment on the broken line subgrade and find the monitoring sensitive point, and then evaluate its safety state based on deformation law, PLAXIS was used to simulate the deformation law of embankment on the broken line subgrade in the filling period, the normal operation period, and the case of rainfall infiltration. Results showed that the monitoring sensitive points of the filling period were mainly distributed in slope crest of each filling layer. In the operation period they were located in the tension fracture area of top and shear outlet of landslide of toe, which was likely due to an arc sliding result from the soil mechanics parameters attenuation. However, monitoring sensitive points would be distributed in the upper part of embankment in rainwater infiltration region when raining. That was because embankment slides locally would be occurred with the increase of rainfall depth. Finally, this paper identified the risk level of the embankment based on the size of the displacement in the process of deformation development of the embankment.

Key words: road engineering, fill embankment, deformation law, numerical simulation;safety status

摘要： 为了研究折线地基上路堤变形规律，找到监测敏感点，进而基于变形规律对其安全状况进行评价，采用有限元软件PLAXIS对折线地基上路堤在填筑期、正常运营期以及降雨入渗情况下的变形规律进行数值模拟。结果表明：填筑期路堤监测敏感点主要分布在每层填筑的坡顶；运营期路堤会由于土体力学参数衰减而发生圆弧滑动破坏，监测敏感点位于坡顶拉裂区及坡脚滑动剪出口处；降雨条件下路堤会随着降雨深度的增加而发生局部滑动破坏，此时监测敏感点主要分布在雨水入渗范围内路堤的上部。最后依据路堤在变形发展过程中位移量的大小确定了路堤所处的风险等级。

关键词: 道路工程, 填方路堤, 变形规律, 数值模拟, 安全状况