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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。
Aiming at the special case of mountain embankment encroachment on river channel, a one-dimensional mathematical model of embankment stratified flow was proposed. The reason of instability and stability calculation of Linhe embankment slope was analyzed. Based on this, Calculation of Critical Narrow Beam of Embankment Occupy River. The study shows that embankment invades the water flow of embankment will aggravate the erosion of embankment slope by water flow, scour the embankment, change the geometry of the slope, and then induce the instability of the slope, resulting in the destruction of the subgrade. The narrowness of embankment to the river course is directly related to the stability of embankment slope and road traffic safety. The smaller the beam width is, the narrower the space of the road is. The larger the beam width is, the stronger the effect of water erosion is and the more unstable the embankment slope is. Therefore, the method of calculating the critical bundle width can provide a theoretical basis for route selection and design of the highway along the river in mountainous areas.