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生产建设项目产生的弃土弃渣堆积体成为人为水土流失的主要来源,准确、快速测算其水土流失量是迫切的社会需求。本研究采用室内人工模拟降雨试验方法,研究了黄土区工程土石混合堆积体土质可蚀性K值,提出了工程堆积体土壤侵蚀标准试验小区定义,坡度设定为25°。以此为标准,测算出黄土质重壤土娄土纯土体,石砾含量10%、20%、30%土石混合体的可蚀性K值分别为0.0224、0.0208、0.0188、0.0074 t·hm2·h/(hm2·MJ·mm);分析得出,随着石砾含量增加,土石混合土质可蚀性K值呈线性减小。以纯土体类型为分析基准,建立了不同含石量条件下的土质可蚀性因子Ki与纯土体土壤可蚀性K0和石砾含量Pi之间的简化转化关系式,以便在有关地区参考应用。
Abandoned spoil stacks produced by construction and production projects become the main source of man-made soil and water loss. Accurate and rapid measurement of the amount of soil and water loss is an urgent social need. In this study, indoor artificial simulated rainfall test method was used to study the erodibility value of soil erodibility of mixed rock and soil samples in the loess area. A definition of the standard test plot of soil erosion in the project sediment was proposed. The slope was set at 25 °. Based on this, the erodibility values of 10%, 20%, 30% soil-rock mixture of pure loess loess with loess soil were calculated as 0.0224,0.0208,0.0188,0.0074 t · hm2 · h / (hm2 · MJ · mm). The analysis shows that as the content of gravel increases, the erodibility value of soil-stone mixed soil decreases linearly. Based on the analysis of pure soil type, the simplified conversion relation between soil erodibility factor Ki and soil erodibility K0 and stone content Pi under different conditions of stone content was established, application.