Effects of segregation in binary granular mixture avalanches down inclined chutes impinging on defending structures

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• 作者：Yuzhang Bi ; Siming He ; Xinpo Li ; Chaojun Ouyang ; Yong Wu
• 关键词：Granular avalanches ; Discrete element method ; Segregation ; Retaining wall ; Impact force
• 刊名：Environmental Earth Sciences
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：75
• 期：3
• 全文大小：1,511 KB
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• 作者单位：Yuzhang Bi (1) (2) (3) (4)
  Siming He (1) (2) (4)
  Xinpo Li (1) (2)
  Chaojun Ouyang (1) (2)
  Yong Wu (1) (2)
  
  1. Key Laboratory of Mountain Hazards and Earth Surface Process, Chinese Academy of Science, Chengdu, China
  2. Institute of Mountain Hazards and Environment (IMHE), Chinese Academy of Sciences (CAS), #.9, Block 4, Renminnanlu Road, Chengdu, China
  3. College of Zijin Mining, Fuzhou University, Fuzhou, China
  4. Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing, China
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：None Assigned
• 出版者：Springer Berlin Heidelberg
• ISSN：1866-6299

文摘

This study investigates the segregation processes and impact response of binary granular mixtures with identical densities but different sizes particles subjected to gravity. Deposition was compared using discrete element method (DEM) numerical experiment and laboratory experiment to determine the material parameters in the particle flow code in three dimensions (PFC3D). With proper material parameters, many numerical experiments were performed on an idealized binary granular mixture avalanche to reveal its kinetic properties, with a particular focus on the results of the final run-out distance, fluid velocity, and impact force exerted on defending structures. The simulation results show that the energy dissipation in granular avalanches is higher with uniform particle sizes than with mixed particle sizes, indicating lesser energy dissipation in segregation processes. Coarse particles also play an important role in determining the kinetic properties of binary granular mixture avalanches; specifically, they obviously affect the maximum impact force when the storage area length is small. On the other hand, fine particles play an important role when the storage area length is large. These results suggest that the effects of coarse particles in granular avalanches containing more than one particle size may be at least as important.