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为室内试验中更好地模拟工程堆积体,利用图像分析法和经典统计学方法对6大典型水蚀区的368座工程堆积体中粒径D>1cm的坡面砾石的分布和含量进行概化分析,得到工程堆积体下垫面上中下坡位砾石含量的概化区间。结果表明:工程堆积体坡面各粒径砾石含量大多服从正态分布,且山区和平原丘陵区之间的砾石总含量有显著性差异。工程堆积体坡面砾石重力分选作用明显,且随着砾石粒径的增加,分选程度增大。在室内进行工程堆积体下垫面设计时,山区堆积体的砾石总含量宜设置在50%~60%,其中,细粒砾石含量宜设置在20%~30%,中粒砾石含量宜设置在10%~15%,粗粒砾石和巨粒砾石含量宜设置为10%,堆积体上中下坡位坡面砾石含量配比宜设置为1∶1.3∶1.5;平原丘陵区的砾石总含量宜设置在15%~20%,其中细粒砾石、中粒砾石、粗粒砾石、巨粒砾石含量分别宜设置为5%~10%,3%~7%,2%~5%,2%~3%,堆积体上中下坡位坡面砾石含量配比宜设置为1∶1.5∶2.5。
In order to better simulate engineering stacks for indoor experiments, the distribution and content of slope gravel with D> 1cm in size in 368 stacks of six typical water erosion zones were generalized by using image analysis and classical statistical methods After analysis, we get the generalized interval of gravel content in the mid-down slope on the underlying surface of the project stack. The results show that most of the gravel content of the gravel on the slope of the heaped body obeys normal distribution, and there is a significant difference in the total gravel content between the mountainous area and the hilly area of the plain. The gravity grading of the gravel on the slope of the pile body of the project is obvious, and as the gravel diameter increases, the degree of sorting increases. When designing the underlaying surface of engineering stack indoors, the total gravel content in the mountain area should be set at 50% -60%, among which, the content of fine gravel should be set at 20% -30%, the gravel content should be set at 10% ~ 15%, coarse gravel and gravel content should be set to 10%, on the slope of the slope on the slope of the gravel content should be set to 1: 1.3: 1.5; total hilly gravel content should The content of fine gravel, medium gravel, coarse gravel and gravel gravel should be set at 5% ~ 10%, 3% ~ 7%, 2% ~ 5%, 2% ~ 3%, and the ratio of the gravel content on the slope on the up and down slope of the pile body should be set to 1: 1.5: 2.5.