膨胀土地区填方路基滑坡原因分析及治理

Analysis of causes of landslide of filled roadbed in expansive soil area and discussion on treatment

以某膨胀土斜坡填方公路为研究对象,分析了膨胀土地区填方路基滑坡产生的原因并进行了有限元分析。结果表明:在膨胀土的斜坡填方路基设计中,应加强对地表水和地下水的拦截和疏导;通过有限元模拟验证了黏土层的强度降低是引起路堤滑移的原因,得到了现状路基的水平位移为3.7 cm,竖向隆起为1.9 cm,与现场变形情况一致;对路基滑坡提出了截排水等针对性的解决措施。

Taking an expansive soil slope filled highway as the research object,the causes of embankment landslide in expansive soil area are analyzed.The results show that:in the design of slope filling subgrade of expansive soil,the interception and dredging of surface water and groundwater should be strengthened.The strength reduction of clay layer is verified by finite element simulation which causes embankment slip,the horizontal displacement and vertical uplift of the existing subgrade are 3.7 cm and 1.9 cm respectively,which are consistent with the field deformation.This paper puts forward the corresponding solutions such as interception and drainage for subgrade landslide.