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Surge Impact of Granular Flows: Effects of Water Content
Zhou GD(周公旦)1,2; D. Song1,2; C. E. Choi3,4; A. Pasuto5; Q. C. Sun6; D. F. Dai7
Source PublicationLandslides
Understanding the fundamental dynamics of interaction between multi-phase geophysical flows and engineering structures is crucial for mitigating geophysical hazards. Specifically, liquid phase between particles induces matric suction which could play a significant part in regulating flow dynamics and warrants further consideration. In this study, flume model tests were conducted to investigate the effects of water content (0–30%) on the impact behavior of granular flows. The particle image velocimetry technique
was adopted to visualize the impact kinematics and the impact force was measured through a model barrier system. Results revealed that, besides geometric effects (kinetic sieving), mechanical effects (shearing and collision) are also vital for the mechanism of reverse segregation. At higher water contents, 20 and 30% in this study, discrete-surge impact, rather than a progressive impact process, was observed. The discrete surges induce impulses on the barrier. The discrete surges result from selforganization of unsaturated granular flows to overcome the enhanced shear strength induced by matric suction. Finally, a dimensionless index, namely the suction number, is used to quantify
the effect of suction on the dynamic behavior of granular flows. Even for large-scale geophysical flows, if the content of fine particles is high, effect of suction should not be neglected.
KeywordGranular Flows Impact Behavior Water Content Discrete Surges Matric Suction
Subject Area自然地理学
Indexed BySCI
Citation statistics
Cited Times:14[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Key Laboratory of Mountain Hazards and Earth Surface Process/Institute of Mountain Hazards and Environment, Chinese Academy of Sciences (CAS), Chengdu, China
2.University of Chinese Academy of Sciences, Beijing, China
3.Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology,Clear Water Bay, Kowloon, Hong Kong
4.The HKUST Jockey Club Institute for Advanced Study, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
5.Research Institute for Geological and Hydrological Hazard Prevention, National Research Council of Italy, Padova, Italy
6.State Key Laboratory for Hydroscience and Engineering, Tsinghua University, Beijing, China
7.Kunming Dongchuan Debris Flow Prevention and Control Institute, Kunming, China
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
Zhou GD,D. Song,C. E. Choi,et al. Surge Impact of Granular Flows: Effects of Water Content[J]. Landslides,2018,15(4):695–709.
APA Zhou GD,D. Song,C. E. Choi,A. Pasuto,Q. C. Sun,&D. F. Dai.(2018).Surge Impact of Granular Flows: Effects of Water Content.Landslides,15(4),695–709.
MLA Zhou GD,et al."Surge Impact of Granular Flows: Effects of Water Content".Landslides 15.4(2018):695–709.
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