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试验选取江西红壤为研究对象,设计四种降雨强度(1.0、1.5、2.0、2.5mm/min)与四种砾石含量百分数(0%、10%、20%、30%)相组合,在室内通过降雨试验对坡顶平台有车碾压堆积体在降雨过程中的流速、径流含沙量和侵蚀速率的变化规律进行了研究。结果表明:堆积体坡面径流流速在整个降雨过程中大体上处于稳定波动状态,是降雨强度和砾石含量共同作用的结果,并得到了流速与降雨强度和砾石含量的关系式;径流含沙量随时间变化曲线可被描述为“先增大—再小幅度减小—再稳定—再急剧减小—最后小幅度上升”的趋势,同时分析得到了坡顶平台有车碾压堆积体出现二次侵蚀的临界时间为降雨后48min左右;侵蚀速率随着降雨强度和砾石含量的增大均会增大,拟合了侵蚀速率与降雨强度和砾石含量的关系式。
In this study, red soil in Jiangxi Province was selected as the research object. Four kinds of rainfall intensities (1.0,1.5,2.0,2.5mm / min) were designed to combine with four kinds of gravel content (0%, 10%, 20%, 30% Rainfall test was carried out to investigate the variation of flow rate, runoff sediment concentration and erosion rate of rolling compacted deposits on the top platform during rainfall. The results show that the flow velocity of runoff on the slope surface of the sediment is in a stable state during the whole rainfall, which is the result of the interaction between rainfall intensity and gravel content. The relationship between the flow velocity and rainfall intensity and gravel content is obtained. The runoff sediment concentration The curves over time can be described as the trend of “first increase - then small decrease - again stable - then sharp decrease - finally small increase”, and at the same time, The critical time for secondary erosion is about 48 minutes after rainfall. The erosion rate increases with the increase of rainfall intensity and gravel content, and the relationship between erosion rate and rainfall intensity and gravel content is fitted.