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生产建设项目形成大量的弃土弃渣,即工程堆积体,坡度陡峻,物质组成复杂,土体多含石砾,且较为松散,具有区别于自然坡地独特的侵蚀机理与水土流失规律。通过对野外工程堆积体的下垫面进行概化,采用室内人工模拟降雨试验,对黄土区坡度在15°~35°条件下的工程堆积体地形坡度因子S值进行了修订。在明确定义我国工程堆积体标准径流小区和坡度因子的基础上,建立了黄土区工程堆积体地形坡度因子的幂函数和三角函数关系式,得到了坡度在15°~35°之间的坡度因子S值的查算表,并建立了土石体类型条件下坡度因子Si与纯土体类型条件下坡度因子So和石砾含量Pi之间的线性关系式,以期为黄土区工程堆积体水蚀测算模型的建立提供科学依据。
Production and construction projects form a large amount of spoil, that is, engineering deposits, steep slope, complex material composition, the soil contains more gravel, and more loose, with a unique natural erosion slope erosion and water and soil erosion laws. Through the generalization of the underlying surface of the stack in the field engineering, the simulated indoor rainfall experiment was adopted to modify the slope factor S value of the topography of the project stack in the loess area with the slope of 15 ° -35 °. Based on the clear definition of the standard runoff plot and slope factor of China’s engineering deposit, the power function and trigonometric function of the slope factor of the topography of the sediment in the Loess Plateau were established, and the slope factor between 15 ° and 35 ° was obtained S value of the calculation table, and the establishment of soil type under the condition of slope factor Si and pure soil type under the slope factor So and the gravel content of Pi between the linear relationship, with a view to the calculation of loess area water body erosion calculation model The establishment of a scientific basis.