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Journal of Mountain Science

, Volume 16, Issue 4, pp 793–805 | Cite as

Spatial-temporal distribution of debris flow impact pressure on rigid barrier

  • Dao-chuan Liu
  • Yong YouEmail author
  • Jin-feng Liu
  • Yong Li
  • Guang-ze Zhang
  • Dong Wang
Article
  • 13 Downloads

Abstract

Grain composition plays a vital role in impact pressure of debris flow. Current approaches treat debris flow as uniform fluid and almost ignore its granular effects. A series of flume experiments have been carried out to explore the granular influence on the impact process of debris flow by using a contact surface pressure gauge sensor (Tactilus®, produced by Sensor Products LLC). It is found that the maximum impact pressure for debris flow of low density fluctuates drastically with a long duration time while the fluctuation for flow of high density is short in time, respectively presenting logarithmic and linear form in longitudinal attenuation. This can be ascribed to the turbulence effect in the former and grain collisions and grain-fluid interaction in the latter. The horizontal distribution of the impact pressure can be considered as the equivalent distribution. For engineering purposes, the longitudinal distribution of the pressure can be generalized to a triangular distribution, from which a new impact method considering granular effects is proposed.

Keywords

Debris flow Impact force Grain composition Spatio-temporal distribution Dynamic coefficient 

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Notes

Acknowledgement

This work was funded by the Research on Prevention and Control Technology of Ecological Debris Flow Disasters from Department of Land and Resources of Sichuan Province (Grant No. KJ-2018-24); the Natural Science Foundation of China (Grant No. 41772343); the Chinese Academy of Sciences and Organization Department of Sichuan Provincial Party Committee “Light of West China” Program (the key control techniques of glacial debris flow along the Sichuan-Tibet Railway), the Key International S&T Cooperation Projects (Grant No. 2016YFE0122400) and the Natural Science Foundation of China (Grant No. 41471011).

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Copyright information

© Science Press, Institute of Mountain Hazards and Environment, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Key Laboratory of Mountain Hazards and Earth Surface Processes, and Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengduChina
  2. 2.University of Chinese Academy of SciencesBeijingChina
  3. 3.China Railway Eryuan Engineering Group co., LTDChengduChina

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