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结合路基边坡地形特点,在具体分析修正通用土壤流失方程(RUSLE)中地形因子计算方法的基础上,评价了路基边坡地形因子计算方法的适应性问题,并以位于湖北沪蓉西高速公路恩施至利川段公路路基边坡土壤侵蚀实测数据为基础,提出了修正方法。结果表明:(1)RUSLE中坡长因子用公式L=(λ/22.1)m计算,但公路路基边坡中坡度一般超过RUSLE的适用范围,因此不能用原有方法对m值进行核定;(2)公路路基边坡坡长因子L可用L=(λ/22.1)0.35计算;(3)67%、100%这两个路基边坡常见的坡度超出了以往的研究范围,不能用已有坡度公式计算;(4)33%、67%和100%坡度的坡度因子值分别是3.70、7.18和10.37。
Based on the topographic features of the subgrade slope, based on the concrete analysis of the method of calculating the topographic factors in the generalized soil loss equation (RUSLE), the adaptability of the calculation method of topographic factors in subgrade slope is evaluated. Based on the measured data of soil erosion on the slope of subgrade of Enshi-Lichuan section, a correction method is proposed. The results show that: (1) The slope length factor in RUSLE is calculated by the formula L = (λ / 22.1) m, but the slope of highway subgrade slope generally exceeds the applicable range of RUSLE. Therefore, m value can not be verified by the original method; 2) The length factor L of slope on highway embankment can be calculated by L = (λ / 22.1) 0.35; (3) The common slopes of 67% and 100% of the two embankment slopes are beyond the scope of previous studies, Formula; (4) The slope factor values for the 33%, 67% and 100% slopes are 3.70, 7.18 and 10.37, respectively.