基于能量法的高等级公路路堤边坡冲刷临界坡度研究

针对目前路基边坡冲刷临界坡度研究存在的不足，在分析边坡径流水力学特性的基础上，根据物质能量守恒和转化原理，对边坡土水力冲刷过程从能量的角度进行描述，得出了各主要坡面冲刷影响因素(降雨、路面宽度、路基高、路面横坡、路面与坡面的粗糙系数)与冲刷临界坡度的函数关系．结合工程实际，以临界坡度为中点定出一个合理的极限坡度范围．在进行边坡设计时，避开2个坡度界限值，以达到不设防护设施或减少防护工程量的目的．

Research on critical gradient for erosion of expressway embank slope based on energy method

Aiming at the deficiency of research on critical gradient of slope, the hydraulics particularity of slope is analyzed. The processes of water erosion of slope are described from the viewpoint of energy conservation and transformation. The functional relationship between influence factors of erosion and critical gradient is gained. The influence factors include raining intensity, pavement width, pavement crossing gradient, slope height, slope roughness and pavement roughness. Combining with project practice, a reasonable range of threshold gradient is educed with critical gradient as midpoint. When gradient of slop is designed, gradient may be kept from the couple of gradient limits, which can reduce protection project quantity or not build protection establishment.