某车站膨胀土路堤坍滑原因分析及整治

Analysis of Reason for Landslide Disease at Expansive Soil Embankment and Control Measures

研究目的：某车站DK51＋800-DK51＋880左侧路堤段出现路基下沉、开裂变形和外移，形成坍滑病害，影响线路的正常运营。本文在详细分析塌滑病害产生原因的基础上，采用应急措施和永久治理相结合的方案对路堤坍塌进行治理，供今后类似工程借鉴。研究结论：（1）斜坡路堤路基病害应急抢险工程可优先采用微型组合桩；（2）膨胀土地基路堤应加强路基的防排水工程设计；（3）位于斜坡膨胀土地基上的路堤，设计时应加强稳定性计算分析；（4）确定加固方案时应做到统筹兼顾，有条件时应急抢险工程要做到永临结合；（5）本研究成果可为膨胀土地基路堤设计时应注意的问题和给出解决办法提供参考。

Research purposes： The subsidence, station occurred in DK 51 ＋ 800 - DK 51 ＋ 880 Based on analyzing the causes of the landslide deformation and cracking of subgrade which were on the left side of a , and it became the landslide disease, endangering the traffic safety. disease in detail, the practice proved that the subgrade was safe and stable by the way of the combination of emergency measures and permanent treatment Through treatment and summary of a landslide disease at expansive soil embankment, it could be used for reference in the similar project. Research conclusions：（ 1 ） The micro composite piles could be firstly adopted in the emergency rescue project of the sloping subgrade. （2） More attention of waterproof and drainage engineering design shoud be payed to the expansive soil subgrade embankment. （3） The stability analysis shoud be more for the embankment situated on the slope expansive soil foundation. （4） Overall planning should be considered when determining the reinforcement scheme and the emergency rescue project need to the combination of temporary and research results can provide the reference for the problems design under similar geological conditions in the future. permanent engineering when condition permitted. （5） The that should pay attention to and their solutions in the subgrade