分形粒径分布对颗粒流粒径分选的影响规律

doi:10.13722/j.cnki.jrme.2020.0748

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摘要高速远程滑坡反粒序及其形成机制是目前研究的热点问题，为进一步探讨该问题，以高速远程滑坡分形粒径分布特征为依据，通过物理模型实验与数值模拟方法，研究不同分形维数颗粒流堆积体的粒径分布特征及其对应的颗粒分选过程，结果表明：随着颗粒流分形维数的增大，细颗粒含量的增加，颗粒流运动过程中不同粒径颗粒的分选作用减弱，导致堆积体中反粒序的发育程度降低；在不同粒径组成条件下，颗粒流前缘及尾部主要呈离散态运动，中部则以密集态为主，仅表面局部颗粒发生离散，颗粒流堆积体中反粒序的形成是多种分选机制综合作用的结果。基于结果分析，高速远程滑坡运动过程中整体不具备颗粒分选的条件，仅在局部范围内可能存在颗粒分选作用。

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	李坤1
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	王玉峰1
	程谦恭1
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	林小龙4

关键词 ：边坡工程, 分形维数, 高速远程滑坡, 颗粒流, 颗粒分选, 反粒序

Abstract：The inverse grading of high-speed and long-runout landslide deposits and its forming mechanisms are hot research topics currently. To further explore these issues，a series of experiments and numerical simulations were conducted to investigate the grain size distribution of the deposits and the corresponding segregation process of granular flows with different fractal dimensions based on the fractal particle size distribution of the deposits. The results show that with increasing the fractal dimension and the enrichment of the fine particles，the segregation process in the granular flow is weakened，resulting in a lower degree of inverse grading in the deposits. For granular flows with different compositions，the leading and tailing edges are highly dispersed，while the main bodies are densely packed with limited dispersion of particles on the flow surface. The formation of the inverse grading in the deposits is attributed to various segregation mechanisms. Based on the analysis，the requirements for segregation cannot be fully satisfied in the emplacement of high-speed and long-runout landslides except for local segregation process.

Key words： slope engineering fractal dimension high-speed and long-runout landslides granular flow segregation inverse grading

引用本文:

李坤1，2，王玉峰1，程谦恭1，2，3，林小龙4. 分形粒径分布对颗粒流粒径分选的影响规律[J]. 岩石力学与工程学报, 2021, 40(2): 330-343.
LI Kun1，2，WANG Yufeng1，CHENG Qiangong1，2，3，LIN Xiaolong4. Effects of fractal particle size distribution on segregation of granular flows. , 2021, 40(2): 330-343.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2020.0748 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/I2/330

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