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| Effects of fractal particle size distribution on segregation of granular flows |
| LI Kun1，2，WANG Yufeng1，CHENG Qiangong1，2，3，LIN Xiaolong4 |
(1. Department of Geological Engineering，Southwest Jiaotong University，Chengdu，Sichuan 611756，China；2. Key Laboratory of High-speed Railway Engineering，Ministry of Education，Southwest Jiaotong University，Chengdu，Sichuan 610031，China；3. State-province Joint Engineering Laboratory of Spatial Information Technology for High-speed Railway Safety，Southwest Jiaotong University，Chengdu，Sichuan 611756，China；4. China Railway Academy Chengdu Co.，Ltd.，Chengdu，Sichuan 610032，China)
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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.
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2021, Vol. 40 
