Landslides

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Numerical analysis of effect of baffle configuration on impact force exerted from rock avalanches

  • YuZhang Bi
  • YanJun Du
  • SiMing He
  • XinPo Sun
  • DongPo Wang
  • XinPo Li
  • Heng Liang
  • Yong Wu
Technical Note
  • 96 Downloads

Abstract

In mountainous areas, channelized rock avalanches swarm downslope leading to large impact forces on building structures in residential areas. Arrays of rock avalanche baffles are usually installed in front of rigid barriers to attenuate the flow energy of rock avalanches. However, previous studies have not sufficiently addressed the mechanisms of interaction between the rock avalanches and baffles. In addition, empirical design approaches such as debris flow (Tang et al., Quat Int 250:63–73, 2012), rockfall (Spang and Rautenstrauch, 1237–1243, 1988), snow avalanches (Favier et al., 14:3–15, 2012), and rock avalanches (Manzella and Labiouse, Landslides 10:23–36, 2013), which are applied in natural geo-disasters mitigation cannot met construction requirements. This study presents details of numerical modeling using the discrete element method (DEM) to investigate the effect of the configuration of baffles (number and spacing of baffle columns and rows) on the impact force that rock avalanches exert on baffles. The numerical modeling is firstly conducted to provide insights into the flow interaction between rock avalanches and an array of baffles. Then, a modeling analysis is made to investigate the change pattern of the impact force with respect to baffle configurations. The results demonstrate that three crucial influencing factors (baffle row numbers, baffle column spacing, and baffle row spacing) have close relationship with energy dissipation of baffles. Interestingly, it is found that capacity of energy dissipation of baffles increases with increasing baffle row numbers and baffle row spacing, while it decreases with increasing baffle column spacing. The results obtained from this study are useful for facilitating design of baffles against rock avalanches.

Keywords

Rock avalanches Discrete element method Baffles Interaction mechanisms Energy dissipation 

Notes

Acknowledgements

The authors thank all anonymous reviewers for helpful suggestions. The authors also thank Mr. Chen Zheng for conducting part of the laboratory tests.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • YuZhang Bi
    • 1
  • YanJun Du
    • 1
  • SiMing He
    • 2
    • 3
    • 4
  • XinPo Sun
    • 5
  • DongPo Wang
    • 6
  • XinPo Li
    • 2
    • 4
  • Heng Liang
    • 2
    • 4
  • Yong Wu
    • 2
    • 4
  1. 1.Institute of Geotechnical Engineering, School of TransportationSoutheast UniversityNanjingChina
  2. 2.Key laboratory of Mountain Hazards and Earth Surface ProcessChinese Academy of ScienceChengduChina
  3. 3.Center for Excellence in Tibetan Plateau Earth SciencesChinese Academy of SciencesBeijingChina
  4. 4.Institute of Mountain Hazards and Environment (IMHE)Chinese Academy of SciencesChengduChina
  5. 5.School of Civil EngineeringSichuan University of Science & EngineeringZigongChina
  6. 6.State Key Laboratory of Geohazard Prevention and Geoenvironment ProtectionChengdu University of TechnologyChengduChina

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