中文摘要：

针对山区公路路堤侵占河道的特殊情况,提出了路堤束窄河段水流计算的一维数学模型;分析了束窄河段临河路堤边坡失稳原因和稳定性计算方法;在此基础上提出了路堤侵占河道的临界束窄度计算方法。研究表明,路基侵占河道挤压水流,会加剧水流对路堤边坡的冲刷、淘刷堤脚,改变边坡的几何形状,进而诱发边坡失稳,造成路基破坏。路堤对河道的束窄程度直接关系着路堤边坡的稳定性和公路交通安全。束窄度越小,道路布线空间越狭窄;束窄度越大,水流冲刷作用越强,路堤边坡越不稳定。因此,临界束窄度的计算方法可以为山区沿河公路的选线和设计提供理论依据。

英文摘要：

On the basis of the special circumstance that embankment compresses the river in mountainous areas,a 1-D flow calculation mode of river block is proposed;the reason of embankment slope failure closed to river block and its stability calculation are analyzed;the method to calculate shock compression limitation are proposed.The results show that erosion of embankment slope and toe will be more severewhen embankment compresses the river.These will change the shape of the embankment slope,and theninduce slope instability and roadbed damage.The degree that embankment compresses the river influenceem bankment slope stability and traffic safety.Smaller the embankment compression is,more narrow theroad will be,and it＇s more detrimental to safe driving;larger the embankment compression is,more severe the erosion will be,and it＇s more detrimental to slope stability.Therefore,the method to calculate shock compression limitation is theory for road alignment and design.