陕-甘G312高速公路彬县滑坡群稳定性数值分析

Numerical analysis on the Binxian county landslide group stability along Shanxi-Gansu G312 Expressway

由于地质环境薄弱,在西部公路等基础设施建设中,存在很多工程地质问题。陕甘G312高速公路彬县滑坡群就座落在公路连接线经过的泾河左岸与黄土塬之间的斜坡沟壑地带。对公路的正常的运营存在潜在威胁。在探明滑坡群工程地质特征和成因机制基础上,采用边坡稳定性分析软件FLAC/SLOPE,将滑坡群分成3个相对独立的滑坡体单元(Ⅰ号滑坡、Ⅱ号滑坡、Ⅲ号滑坡),选取4个具有代表性的地质剖面,建立地质模型。并按天然状态和饱和状态对滑坡群的稳定性进行了数值分析。剪应变率云图和稳定性计算结果表明,滑坡群在天然及饱和状态下均处于稳定状态。但滑坡群剪出口以下因公路开挖而形成的边坡处于不稳定状态。与现场变形现象相吻合。

There are many engineering geological problems in western constructions because of weak geologic environment.The landslide group on conjugation line between Shanxi-Gansu G312 Expressway and Binxian is located on slopes of ravine between left side of Jing Rives and loess tableland.Once the landslide is unstable,the normal traffic would be blocked.According to the engineering geologic features and cause of formation,the landslide group is divided into three comparatively absolute landslide units（Ⅰ landslide,Ⅱ landslide,Ⅲ landslide） with the program of FLAC/Slop which is used to analyze the stability of the landslide.Four representative geologic of FLAC/Slop which is used to analyze the stability of the landslide.Four representative geologic profiles are modeled in order to analyze the stability of the landslides with numerical analysis in natural state and saturated state.However,the parts beneath front side of landslide group are unstable,which accords with local deformation.