• 中文核心期刊
  • 中国科技核心期刊
  • CSCD收录期刊
  • 美国《化学文摘》收录期刊
  • Scopus数据库收录期刊
高级检索

泥石流堆积物的粒度分布及其分形结构

倪化勇, 刘希林

倪化勇, 刘希林. 泥石流堆积物的粒度分布及其分形结构[J]. 沉积与特提斯地质, 2008, 28(3): 35-40.
引用本文: 倪化勇, 刘希林. 泥石流堆积物的粒度分布及其分形结构[J]. 沉积与特提斯地质, 2008, 28(3): 35-40.
NI Hua-yong, LIU Xi-lin. Grain-size distribution and fractal structures of solid grains in debris-flow deposits[J]. Sedimentary Geology and Tethyan Geology, 2008, 28(3): 35-40.
Citation: NI Hua-yong, LIU Xi-lin. Grain-size distribution and fractal structures of solid grains in debris-flow deposits[J]. Sedimentary Geology and Tethyan Geology, 2008, 28(3): 35-40.

泥石流堆积物的粒度分布及其分形结构

基金项目: 

中国地质调查局“四川省泸定县地质灾害详细调查项目”(1212010640503)

Grain-size distribution and fractal structures of solid grains in debris-flow deposits

  • 摘要: 泥石流堆积物主要由砾石、砂砾、粉粒和粘粒组成,组成泥石流堆积物的颗粒级配变幅很大,从直径大于数十米的巨砾到肉眼难以看见的几微米的胶体微粒均有分布,大小颗粒粒径之比可达106~107。泥石流堆积物颗粒具有明显的自相似性和无标度区间。本文以小江流域多处泥石流堆积物为研究对象,采用图解法全面分析了泥石流堆积物的粒度组成特征,根据分形理论计算了泥石流堆积物颗粒的分维值,对泥石流堆积物的分形特征进行探讨,并与泥石流堆积物粒度特征相联系,发现分维很好的反映了泥石流堆积物颗粒组成及其粒度分布特征。将泥石流堆积物颗粒分维与泥石流的粘性、形成年代等性质相联系,以找出它们彼此之间的关系。
    Abstract: Debris flow can be seen as a two-phase rheological fluid with soil-fluid compositions,and the debris-flow deposits consist of mud,silt,sandy gravel,boulder,etc.,with grain sizes ranging from several microns to more than tens of meters.Consequently,solid grains in the debris-flow deposits display a marked self-similarity in geometrical shape and scale-invariance in size according to fractal theory.In this paper,various debris-flow deposits located in the Xiaojiang River basin were collected as studied samples,and the features of grain-size distribution of these deposits are examined through illustration method.Then fractal dimensions of solid grains in these deposits are calculated respectively with the dimension values between 2.5 and 3,showing obvious fractal features of grain-size distribution.Furthermore,the results of grain-size dimensions are consistent with the results obtained through the former method.So fractal dimension can be seen as such a parameter,which reflects the grain composition and grain-size distribution of the debris-flow deposits.Finally,the relationship between fractal dimension,and viscosity and accumulation ages of debris-flow deposits are discussed as more characteristics of debris flow are determined by grain composition and grain-size distribution.
计量
  • 文章访问数:  181
  • HTML全文浏览量:  0
  • PDF下载量:  67
  • 被引次数: 0
出版历程
  • 发布日期:  2008-09-29

目录

    /

    返回文章
    返回