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

现代地质 ›› 2017, Vol. 31 ›› Issue (06): 1278-1283.

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

陈松¹(), 陈剑², 乔春生¹, 马俊学², 刘超²

1.北京交通大学土木建筑工程学院,北京 100044
2.中国地质大学(北京) 工程技术学院,北京 100083

收稿日期:2016-10-26 修回日期:2017-05-19 出版日期:2017-12-10 发布日期:2017-12-25
作者简介:陈松,男,博士研究生,1989年出生,岩土工程专业,主要从事工程地质与地质灾害防治研究。Email:chennsongg@163.com。
基金资助:
国家自然科学基金项目(41571012);国家自然科学基金项目(51278046)

Application of Graphic and Moment Methods on the Analysis of Particle Sizes of Dam-break Accumulations by Xuelongnang Ancient Landslide Lake in the Upper Jinsha River

CHEN Song¹(), CHEN Jian², QIAO Chunsheng¹, MA Junxue², LIU Chao²

1. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China
2. School of Engineering and Technology,China University of Geosciences(Beijing),Beijing 100083

Received:2016-10-26 Revised:2017-05-19 Online:2017-12-10 Published:2017-12-25

摘要/Abstract

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。

关键词: 图解法, 矩值法, 粒度参数, 金沙江上游, 溃坝堆积

Abstract:

According to field investigation and laboratory analysis, grain-size parameters of 50 samples from dam-break accumulations by Xuelongnang ancient landslide in the upper Jinsha River are calculated using graphic and moment methods, and the results are compared. The results show that the average particle size of the three sections,i.e. the upstream, the midstream and the downstream of the dam-break accumulation obtained by the two methods is highly correlated, and the correlation coefficients are 0.948, 0.994, and 0.991, respectively; the correlation coefficients of sorting are 0.824, 0.959 and 0.901, respectively. The results show that the average particle size obtained by the two methods are basically equal and can be replaced by each other. Except the large deviation of the upstream section, the separation coefficients of the other two sections are equal and can be replaced by each other. For the whole dam accumulation body, skewness and kurtosis are more discrete with poor correlation. For the dam-break accumulations, it is recommended that the moment method be optimized to calculate the particle size parameters, which can comprehensively cover the information of the sample and can reflect the environmental change of the dynamic water condition during the whole process. The differences between the result of this study and that of previous studies on other types of sediments are mainly due to the distribution of grain size components, the dynamic condition of deposition and the sedimentary environment.

Key words: graphic method, moment method, grain-size parameter, upper Jinsha River, dam-break accumulation

中图分类号:

P642.2

陈松, 陈剑, 乔春生, 马俊学, 刘超. 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[J]. 现代地质, 2017, 31(06): 1278-1283.

CHEN Song, CHEN Jian, QIAO Chunsheng, MA Junxue, LIU Chao. Application of Graphic and Moment Methods on the Analysis of Particle Sizes of Dam-break Accumulations by Xuelongnang Ancient Landslide Lake in the Upper Jinsha River[J]. Geoscience, 2017, 31(06): 1278-1283.

图/表 4

图1 金沙江上游雪隆囊—王大龙河段地质简图 1.逆断层;2.走滑断层;3.断层;4.第四系沉积物;5.白垩系砾岩、砂岩、泥岩;6.侏罗系砾岩、砂岩、泥岩夹含灰岩;7.三叠系火山岩;8.三叠系砂岩、粉砂岩夹含灰岩;9.三叠系板岩夹含砂岩、灰岩;10.二叠系灰岩、大理岩、片岩;11.二叠系火山岩、大理岩及片岩;12.二叠系片岩夹含大理岩;13.花岗岩

Fig.1 Geological map of the Xuelongnang-Wangdalong reach of the upper Jinsha River

图2 雪隆囊滑坡堰塞湖溃坝堆积体的分布范围(据陈剑[20]图改)

Fig.2 Distribution of the dam-break accumulation induced by the Xuelongnang landslide-dammed lake

图3 溃坝堆积物上、中、下游三段粒度频率曲线

Fig.3 Particle size frequency curves of the upper, middle and lower reaches of the dam-break accumulation

图4 溃坝堆积体矩值法与图解法的粒度参数拟合对比图

Fig.4 Comparison of the grain size parameters of the dam-break accumulation body by the moment(ordinate) and graphical(abscissa) methods

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