某山区公路下边坡变形失稳特征及应对措施

Deformation and Instability Characteristics of Lower Slope of a Mountain Road and its Countermeasures

由于我国西部山区地形陡峻、地质复杂,在陡斜坡上修筑公路,多为陡坡路基、半填半挖路基,容易诱发路基下边坡失稳破坏。本文以G227线K86+610~K86+660段下边坡滑坡为例,系统分析了公路下边坡土质斜坡发生的变形失稳特征及成因,采用传递系数法定量评价了滑坡段的稳定性情况,提出了针对此类变形破坏的措施建议,为西部山区公路及类似工程提供参考。

Mountain roads,especially in western mountainous areas,are located on steep terrain and complicated geology.When roads were built on steep slopes they were most likely to suffer from steep-slope subgrade and semi-filled and semi-excavated subgrade,causing excavation disturbance to the slopes,easily leading to instability and damage of the lower slopes of the subgrade.Taking the landslide at the lower slope of G227 line K86+610-K86+660 as a case study,this paper systematically studied the deformation and failure characteristics and causes of the soil slope at the lower slope of the highway,evaluated the stability of the landslide section,and proposed some treatment measures and strategies for a particular deformation and failure,thus providing a reference for the western mountain road and similar projects.