剑斗互通路堑边坡变形失稳机制分析及治理措施

针对剑斗互通路堑边坡滑坡，通过工程地质调绘，滑坡变形迹象分析、地表监测、深孔位移监测等方法，分析了滑坡变形机制，并对滑坡稳定性进行计算。结果表明:①碎石土与炭质泥岩组合为易滑地层，泥岩遇水软化，易形成软弱滑动带，经边坡开挖后导致边坡失稳；②地表裂缝主要为平行设计公路走向的拉张裂缝；③滑坡体中部地表垂直位移在变形滑动后并经过反压护坡后的规律主要呈一阶指数衰减函数变化。根据滑坡稳定性计算结果，采取刷坡卸载、预应力锚索抗滑桩（圆桩）、预应力锚索地梁、挡土墙及截排水等综合治理措施，滑坡变形得到有效控制，确保高速公路运营期间的安全。

Analysis of Deformation and Failure Mechanism of Cutting Slope along Jiandou Interchange and the Control Measures

For the cutting slope landslide along Jiandou Interchange, the methods, such as engineering geologic surveying and mapping, landslide deformation signs analyzing, surface monitoring, deep hole displacement monitoring, were used to analyze the deformation mechanism of the landslide and calculate its stability. The results show that,①the sliding-prone strata composed of gravel soil and charcoal mudstone form weak slip zone easily due to mudstone softened after absorbing water, thus after excavation, instable slope may be caused; ② the cracks on the surface are mainly tensile cracks parallel to the designed direction of highway; ③ the change law of vertical displacement of earth surface in the middle of landslide after deformation and then back-pressure protection accords with a first-order exponential decay function substantially. According to the calculation result of the landslide stability, the comprehensive control measures, including slope cutting for unloading, pre-stressed anchor cable anti-slide pile (circular pile), pre-stressed anchor cable ground beam, earth retaining wall, and water interception and drainage, are used to control the landslide and guarantee the safety of highway operation.