高等级公路路堤边坡冲刷防护临界坡度的研究

首先分析了路堤边坡冲刷防护必要性及目前边坡冲刷临界坡度研究存在的不足,然后针对这些不足,对边坡径流流速、水深做了较为细致的水力学分析,利用泥沙动力学研究了坡面径流对土颗粒冲刷机理,得出了各主要坡面冲刷影响因素(降雨、坡高、坡面的粗糙系数、土粒比重与直径)与冲刷临界坡度的函数关系,并认为该坡度不是一个常数,而是一个受这些因素影响的可变区间。并利用得出坡度设计的理论依据,定量分析目前设计坡度是否合理和指导边坡设计,具有较大的实用价值。

Critical Grade of Highway Embankment Slope for Erosion Protection

With discussions on the necessity of erosion protection for highway embankment slopes and the deficiencies of previous research of critical grade, hydraulic analyses was carried out on the velocity and depth of runoff on the slope. Functional relationships between the influence factors and the critical grade of slope were then derived, based on mud dynamics and erosion mechanism. It was found that the critical grade is not constant, but a variable range, which was influenced by such factors as rainfall strength, slope height, slope roughness, and specific gravity and size of soil particles. Calculated critical grades could be used as guidelines for slope design with practical values.