Calculation of the separation grid design length in a new water–sediment separation structure for debris flow defense

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• 作者：Tao Xie ; Fangqiang Wei ; Hongjuan Yang…
• 关键词：Debris flow ; Water–sediment separation structure ; Herringbone water–sediment separation grid ; Structure dimension ; Debris flow defense
• 刊名：Bulletin of Engineering Geology and the Environment
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：75
• 期：1
• 页码：101-108
• 全文大小：746 KB
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• 作者单位：Tao Xie (1) (2) (3)
  Fangqiang Wei (2)
  Hongjuan Yang (2)
  James S. Gardner (4)
  Xiangping Xie (1) (2) (3)
  Zhiqiang Dai (2)
  Zhen Jiang (2)
  
  1. Key Laboratory of Mountain Hazards and Earth Surface Process, Chinese Academy of Sciences, Chengdu, China
  2. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, China
  3. University of Chinese Academy of Sciences, Beijing, 100049, China
  4. Clayton Riddell Faculty of Environment, Earth and Resources, University of Manitoba, Winnipeg, Canada
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Applied Geosciences
  Structural Foundations and Hydraulic Engineering
  Geoecology and Natural Processes
  Nature Conservation
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1435-9537

文摘

A new water–sediment separation structure with a herringbone separation grid has been developed for debris flow defense. Previous model experiments showed that, compared to existing structures, this structure can continuously maintain its water–sediment separation function. However, in the structure design, the length of the separation grid is key to its success in separating water and sediment. This paper presents a theoretical formula for calculating the design length of the grid. The theoretical formula shows that the grid length relates to the debris flow velocity v _x, the grid width B, and the grid incline angle θ. A series of model experiments were conducted in the laboratory to test the accuracy of the formula. The results show that the experimental value and the theoretical value for grid length form a linear relationship and the design length of the grid may be corrected by a coefficient. Further analysis indicates that the correction coefficient changes with the bulk density of debris flow. Finally, a formula for determining the grid design length is derived from the theoretical formula, corrected using a coefficient related to the bulk density of a debris flow. Keywords Debris flow Water–sediment separation structure Herringbone water–sediment separation grid Structure dimension Debris flow defense