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| 华北地区公路土质边坡土壤侵蚀实验研究 |
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杨建英1, 韩成军1,2, 叶海英1, 祁有祥1, 赵廷宁3
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1.北京林业大学水土保持学院, 北京 100083;2.青海省水土保持局, 青海西宁 810001;3.北京林业大学边坡绿化研究所, 北京 100083
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| 摘要: |
| 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。 |
| 关键词: 土质边坡 模拟 土壤侵蚀试验 |
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| Experimental Research on Soil Erosion on Earth Side Slope of Highways in North China |
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YANG Jian-ying1, HAN Chen-jun1,2, YE Hai-ying1, QI You-xiang1, ZHAO Ting-ning3
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1.College of Soil and Water ConservationBeijing Forestry UniversityBeijing 100083China;2.Soil and Water Conservation Bureau of Qinghai ProvinceXi’ningQinghai 810001China;3.Institute of Slope RevegetationBeijing Forestry UniversityBeijing 100083China
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| Abstract: |
| 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. |
| Key words: earth side slope simulation soil erosion experiment |