图解法与矩值法在金沙江上游雪隆囊古滑坡堰塞湖溃坝堆积物粒度分析中的应用

发布时间：2018-02-04 01:30

本文关键词： 图解法矩值法粒度参数金沙江上游溃坝堆积　出处：《现代地质》2017年06期 　论文类型：期刊论文

【摘要】：基于野外调查与室内分析,应用图解法和矩值法,分别对金沙江上游雪隆囊古滑坡堰塞湖溃坝堆积物的50个样品的粒度参数进行定量计算,并对两种方法所得结果进行对比研究。结果表明:溃坝堆积物的上、中、下游三个区段的两种计算结果的平均粒径具有高度相关性,相关系数分别为0.948、0.994、0.991,分选性相关系数分别为0.824、0.959、0.901,表明两种方法得到的平均粒径基本相等,可以互相代替;标准偏差(分选系数)除上游区段存在较大偏差外,其它两区段分选系数基本相等,可以相互替代。整个溃坝堆积物粒度的偏态和峰态较离散,相关性较差。针对溃坝型沉积物,建议优先选用矩值法计算粒度参数,该方法能全面涵盖样品信息,反映整个沉积过程中水动力条件的变化。该研究结果与其它类型沉积物研究结果产生差异的主要原因是粒度组分分布情况、沉积动力条件及沉积环境不同。
[Abstract]:Based on field investigation and indoor analysis, the particle size parameters of 50 samples of the dam-break deposit of Xuelong sac ancient landslide in the upper reaches of Jinsha River were calculated quantitatively by using graphical method and moment method. The results of the two methods are compared and studied. The results show that the average particle size of the upstream, middle and downstream sections of the dam break is highly correlated. The correlation coefficients were 0.948% 0.994 ~ 0.991and 0.824 ~ 0.959 ~ 0.901, respectively. The results show that the average particle size obtained by the two methods is basically equal and can be replaced by each other. Except for the large deviation in the upstream section, the separation coefficients of the other two sections are basically equal and can be replaced by each other, and the skewness and peak state of the whole dam break deposit are more discrete. For the dam-break sediment, the moment method is preferred to calculate the particle size parameters, which can fully cover the sample information. The main reasons for the difference between the results of this study and those of other types of sediments are the distribution of particle size, the dynamic conditions and the sedimentary environment.
【作者单位】：北京交通大学土木建筑工程学院;中国地质大学(北京)工程技术学院;
【基金】：国家自然科学基金项目(41571012,51278046)
【分类号】：P642.2
【正文快照】： 0引言沉积物粒度分析是研究沉积环境、沉积及搬运过程和搬运机制的重要方法之一[1-2]。近年来,粒度分析已广泛应用于黄土、古土壤、冰川、海洋、河流、湖泊、泥石流以及浊流等沉积物的研究中[3-13]。表征粒度特征的参数有平均粒径、分选系数、偏态及峰态。目前,计算粒度参数比

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