工程堆积体坡面砾石分布及含量概化

发布时间：2018-03-08 04:36

本文选题：工程堆积体　切入点：砾石　出处：《水土保持学报》2017年05期 　论文类型：期刊论文

【摘要】：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D1cm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。
[Abstract]:In order to simulate the engineering accumulation better in laboratory test, the distribution and content of gravel on the slope with D 1 cm diameter in 368 engineering accumulations in 6 typical water erosion areas were analyzed by image analysis and classical statistical method. The generalizable interval of gravel content in the middle and downhill position on the subsurface of the engineering accumulation body is obtained. The results show that the gravel content of each particle size on the slope surface of the engineering accumulation body is normally distributed. There are significant differences in the total content of gravel between mountainous area and plain hilly area. The gravel-gravel-gravel-sorting effect is obvious on the slope surface of engineering accumulation body, and the separation degree increases with the increase of gravel particle size. The total content of gravel in the mountain area should be set at 50%, in which, The content of fine gravel should be set at 20 / 30, the content of medium grain gravel should be set at 10 / 15, the content of coarse gravels and megaclastic gravel should be set to 10, the ratio of gravel content on the upper and lower slope of the accumulation should be 1: 1.31.5, and the total content of gravel in plain and hilly region should be set at 1: 1.31.5. It is advisable to set it at 15 and 20, in which fine gravel, The content of medium gravels, coarse gravels and macrogravels should be set to 5: 10, respectively, and the ratio of gravel content in the upper and lower slope of the accumulations should be set at 1: 1.5: 2.5.
【作者单位】：中国科学院水利部水土保持研究所;中国科学院大学;西北农林科技大学水土保持研究所;水利部水土保持监测中心;西安高科集团高科房产有限责任公司;
【基金】：国家自然科学基金项目(41601300) 西部青年学者B类(XAB2015B06) 西北农林科技大学基本科研业务费(2452016107)
【分类号】：S157.1

【相似文献】