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以赣北红土为研究对象,通过组合不同砾石质量百分数(0%、10%、20%、30%)、不同降雨强度(1.0、1.5、2.0、2.5mm/min)的室内模拟试验,对开发建设项目中散乱锥状堆积体的产流产沙规律进行研究。结果表明,在相同降雨强度下,含砾石堆积体(10%、20%、30%)的产流时间要明显小于不含砾石堆积体(0%)的产流时间;砾石对径流率的影响不明显,但径流率与降雨强度有明显的正相关关系;在降雨强度≥1.5mm/min的条件下,四种砾石含量堆积体的侵蚀速率在一场60min的降雨中主要经历“浮土冲刷”、“形成结皮”、“可蚀性泥沙减少”和“结皮破坏”四个阶段;一场降雨后堆积体总产沙量随砾石质量百分数的变化依次为0%<10%<20%<30%,砾石能够促进堆积体的坡面侵蚀。
Taking the lateritic red earth in northern Jiangxi as the research object, through the indoor simulation experiments with different gravel mass percentage (0%, 10%, 20%, 30%) and different rainfall intensity (1.0, 1.5, 2.0, 2.5mm / min) Research on the laws of runoff and sediment production in scattered conical heaps in construction projects. The results show that the runoff time of gravel packs (10%, 20%, 30%) is obviously less than that of non-gravel packs (0%) under the same rainfall intensity. The effect of gravel on runoff rate However, the runoff rate and rainfall intensity had a significant positive correlation. Under the conditions of rainfall intensity≥1.5mm / min, the erosion rates of the four kinds of gravelly sediments mainly experienced “floating scouring ”, “ Forming crust ”, “ erodible sediment reduction ”and “ crust destruction ”four stages; after a rainfall total sediment volume change with gravel mass percentage For 0% <10% <20% <30%, gravel can promote slope erosion of the deposit.