某高速公路花岗岩边坡稳定性评价及防护措施研究

Study on Stability Evaluation and Protection Measures of Weathered Granite Slope in a Certain Expressway

花岗岩在我国分布广泛,完整新鲜的花岗岩具有良好的工程地质特性,但受到侵蚀、剥蚀、风化等作用的花岗岩体物理力学性质急剧降低,又会成为工程建设中较难处理的岩石之一。公路建设过程中,风化花岗岩边坡较为普遍。由于这类边坡的特殊岩体性质,在一定条件下容易发生失稳,对公路施工和运营都会造成严重危害。因此,研究这类边坡的变形破坏机制和失稳模式,对边坡的开挖和防治具有重要意义。文章通过对某高速公路一风化花岗岩边坡的现场工程地质勘察,在边坡岩体结构特征、变形破坏机制及失稳模式分析的基础上对边坡的整体稳定性做出了评价,进而对边坡开挖和防护提出有效建议,同时也可为同类风化花岗岩边坡的设计、施工提供理论上的参考。

Granite spreads widely around our country,which has commonly better engineering geology quality,but its physical mechanics property will become poor dramatically and a kind of disposal-difficult rock mass after suffering from corrosion,denudation and weathering,etc.Some weathered granite slopes are very common in the road-building process.Owing to special lithology characteristics,such slopes will easily lose stability to be destroyed in some conditions,which brings serious damage to both construction and use of road.Therefore,study on slope deformation mechanism and stability-losing pattern is very important not only for slope excavation but also for slope support.By investigating the engineering geological conditions of one weathered granite slope along a certain expressway,the paper analysed the rock mass structure characteristics,deformation-failure mechanism and stability-losing pattern,and evaluated the stability value of complete slope.As a result,the corresponding excavation and treatment measures of the slope were suggested.Espeically, the study conclusion will provide theoretical reference and guidance for design and construction of the same kind of slope.