华北地区公路土质边坡土壤侵蚀实验研究

公路建设过程中产生的水土流失非常严重。在标定人工降雨器降雨参数的基础上．研究了华北地区公路土质边坡水土流失规律。结果表明．土体硬度、前期土壤含水量、降雨强度相同条件下．土壤侵蚀量随坡度的增大而增加，在25℃附近达最大值．之后随坡度的增加侵蚀量略有下降并渐趋稳定；土壤侵蚀量随土体硬度的加大而减小，且降雨强度越大这种影响愈显著；前期土体含水量愈大．土壤侵蚀量呈增大趋势。本研究可为科学评价工程土质边坡的水土流失提供依据。

Experimental Research on Soil Erosion on Earth Side Slope of Highways in North China

Soil erosion generated by road construction project is significantly serious.Based on the calibration of the characteristics of rainfall simulator , side slope of different gradients and different degrees of compactness formed in road construction process is studied.Results show that soil erosion is aggravated with increased slop gradient.Soil erosion rate reaches a peak at about 25° , beyond which it begins to decrease and finally goes to a steady state.Moreover , soil erosion is alleviated with increased soil hardness and this trend is more obvious if rainfall intensity becomes much stronger.Additionally , soil erosion is aggravated with the increasing of antecedent soil water content.This study may provide a basis for the scientific evaluation of soil erosion on earth side slope in an engineering project.