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Empirical model for assessing dynamic susceptibility of post-earthquake debris flows
Language英语
Hu, Kaiheng1,2; Wang, Zhang1,2,3; Chen, Cheng1,2,3; Li, Xiuzhen1,2
2019
Source PublicationDebris-Flow Hazards Mitigation: Mechanics, Monitoring, Modeling, and Assessment - Proceedings of the 7th International Conference on Debris-Flow Hazards Mitigation
Author of SourceAccess Limited Construction ; Association of Environmental and Engineering Geologists ; BGC Engineering Inc. ; et al. ; Geobrugg North America ; KANE Geotech Inc.
Pages973-980
meeting7th International Conference on Debris-Flow Hazards Mitigation: Mechanics, Monitoring, Modeling, and Assessment
Conference DateJune 10, 2019 - June 13, 2019
Conference PlaceGolden, CO
CountryUnited states
Contribution Rank1
AbstractParticle size segregation is a common feature in debris-flow deposits and is assumed to develop in a similar way as in dry granular flows where fluid forces are neglected. Solid-fluid coupling however is a defining feature of debris flows and fluid forces must therefore be accounted for in modelling for the segregation that develops therein. This paper presents a numerical investigation of the mechanisms of segregation under the influence of fluid forces. For this, a segment of a fully submerged bi-disperse steady granular flow is simulated using the CFD-DEM method. The solid-fluid interactions come in the form of buoyancy and fluid drag force. It is found that the presence of the fluid generally retards the rate and quality of segregation primarily by promoting the formation of a plug flow in the stream-wise velocity profile. The plug flow region forms at the free surface where it significantly reduces or zeroes out the shear rates thus inhibiting the main mechanisms of segregation, i.e. kinetic sieving and squeeze expulsion, to take place. It is inferred that the rapid shearing that occurs near the base promotes segregation but is unable to proceed towards the free surface due to the presence of the plug flow region that serves as a barrier. The quality of submerged segregation improves at lower angles where the plug flow region is minimized and the usual parabolic shear profile develops. © 2019 Debris-Flow Hazards Mitigation: Mechanics, Monitoring, Modeling, and Assessment - Proceedings of the 7th International Conference on Debris-Flow Hazards Mitigation. All rights reserved.
KeywordBuoyancy Confined flow Debris Drag Granular materials Hazards Particle size Segregation (metallography) Shear flow Surface segregation
DOI10.25676/11124/173119
ISBN9780578510828
URL查看原文
Indexed ByEI
Accession numberAccession number;20200408088117
Citation statistics
Document Type会议论文
Identifierhttp://ir.imde.ac.cn/handle/131551/33788
Collection山地灾害与地表过程重点实验室
Corresponding AuthorHu, Kaiheng
Affiliation1.Key Laboratory of Mountain Hazards and Earth Surface Processes, Chinese Academy of Sciences, Chengdu, Sichuan; 610041, China;
2.Institute of Mountain Hazards and Environment, Chinese Academy of Sciences and Ministry of Water Conservancy, Chengdu, Sichuan; 610041, China;
3.University of Chinese Academy of Sciences, Beijing; 100049, China
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Corresponding 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
Hu, Kaiheng,Wang, Zhang,Chen, Cheng,et al. Empirical model for assessing dynamic susceptibility of post-earthquake debris flows[C]//Access Limited Construction, Association of Environmental and Engineering Geologists, BGC Engineering Inc., et al., Geobrugg North America, KANE Geotech Inc.,2019:973-980.
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