Influence of different retaining structures on landslide–debris flow impact and accumulation characteristics

ZHANG Ruixiao1 FAN Xiaoyi1,2 JIANG Yuanjun3 LI Tianhua1

(1.School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang, Sichuan Province, China 621010)
(2.Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province, Mianyang, Sichuan Province, China 621010)
(3.Institute of Mountain Hazard and Environment, Chinese Academy of Sciences, Chengdu, Sichuan Province, China 610041)

【Abstract】Landslide–debris flow is a common form of motion for high-level landslides. It has the characteristics of large scale, long runout distance, and high flow velocity. The deposit area of landslides and the intensity of hazard could be reduced by the retaining structure. In this study, we used three-dimensional discrete element simulation software to study the accumulation and kinematic characteristics of debris flow with three different retaining structures. The results indicate that the movement direction of the debris flow particles is deflected, and the velocity distribution of the sliding body changes significantly, in which the maximum speed of the sliding body changes from the slope to the trailing edge. As the length of the retaining structure rises, the normal force increases significantly, while the tangential force grows slightly. The area of the stacking area and the maximum horizontal moving distance continue to decrease, and the area of the safe area continues to increase. Also, this paper introduced the dimensionless number (Nk) to analyze the effect of particle sorting effect on the kinematic and accumulation characteristics of different particles. For the same intercept width, the Nk value of K3 is the smallest, while the Nk value of K1 is the largest. The Nk values of three particles gradually increase with the rise of the barrier structure width. After the resistive structure is added, the percentage of debris flow volume exhibits the distribution of an exponential function, and it decreases gradually with the increase in the moving distance. When there is no resistive structure, the percentage of the particle bulk volume exhibits the distribution of Extreme function. It means that the volume distribution reaches the peak near the middle position, and both sides show a decreasing trend.

【Keywords】 debris flow; resistive structure; impact; accumulation characteristics;

【DOI】

【Funds】 National Natural Science Foundation of China (41877524) Opening Fund of Shock and Vibration of Engineering Materials and Structures key Laboratory of Sichuan Province, China (18kfjk10) Postgraduate Innovation Fund Project by Southwest University of Science and Technology (19ycx0080)

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(Translated by LIU T)

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This Article

ISSN:1004-4574

CN: 23-1324/X

Vol 28, No. 04, Pages 52-61

August 2019

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Article Outline

Abstract

  • 1 3D discrete element model
  • 2 Analysis of debris flow impact
  • 3 Analysis of accumulation bodies
  • 4 Conclusions
  • References