On the viscous resistance of marine sediments for estimating their strength and flow characteristics

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• 作者：Sueng Won Jeong ; Sung-Sik Park
• 刊名：Geosciences Journal
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：20
• 期：2
• 页码：149-155
• 全文大小：630 KB
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• 作者单位：Sueng Won Jeong (1) (2)
  Sung-Sik Park (1) (2)
  
  1. Korea Institute of Geoscience and Mineral Resources, Daejeon, 305-350, Republic of Korea
  2. Department of Civil Engineering, Kyungpook National University, Daegu, 702-701, Republic of Korea
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geosciences
  
• 出版者：The Geological Society of Korea, co-published with Springer
• ISSN：1598-7477

文摘

To examine debris flow mobility with respect to the runout distance and velocity, strength parameters (e.g., the Bingham and Herschel-Bulkley yield stresses, undrained shear strength, flow behavior index) are needed. In modeling debris flow, the Bingham and Herschel-Bulkley yield stresses are often used, but they lead to large differences in the runout distance and velocity of the failed masses. It is very difficult to determine the true yield stress. In this study, we propose using the viscous resistance, obtained from the normalized flow curve resulting when the shear stress and shear rate are divided by reference shear stress and shear rate values (i.e., \(\log \tau /\tau _0 - \log \gamma /\gamma _0 \)). The viscous resistance and strength parameters are compared from the viewpoint of geotechnology and rheology. The shear strength and flow characteristics of marine sediments can be characterized in terms of the viscous resistance and the viscous resistance is linearly related to other strength parameters (e.g., viscosity, yield stress and undrained shear strength). Thus, the viscous resistance provides a simple and easy approach for approximating strength and flow parameters in debris flow dynamics.