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Influence of particle-size segregation on the impact of dry granular flow
Jiang, Yuan Jun1; Fan, Xiao-Yi2,3; Li, Tian-Hua2; Xiao, Si-You1,4
Corresponding AuthorFan, Xiao-Yi(fanxiaoyi@swust.edu.cn)
2018
Source PublicationPOWDER TECHNOLOGY
ISSN0032-5910
EISSN1873-328X
Volume340Pages:39-51
SubtypeArticle
AbstractEven though dry granular flow can cause well-known impact hazards to retaining structures, studies rarely have been conducted to determine the influence of particle-size segregation on the impact of dry granular flow. Based on the existing experiments concerning the impact of dry granular flow, we calibrated a code of the Discrete Element Method and designed three numerical simulations. Two types of degree of particle-size segregation N-s and N-l, were defined to show the extent of particle-size segregation in the depth and flow directions. The results of the simulation indicated that a dry granular flow initiated with different degrees of particle-size segregation (N-s) could develop into very distinctive conditions in terms of the relative positions of different groups of particles in the depth and flow directions. The initial deposition with a higher N-s could make it easier for the coarser particles to be located in the front and top of a dry granular flow, with the finer particles being in the tail and bottom of the flow. In the impact process, the greater the values of N-s and N-l are, the more the coarser particles impact the retaining wall at a higher position at an earlier time during the impact. However, a higher degree of segregation of the particle sizes does not necessarily correspond to a higher impact force and action point. It is more rational to use the change of N-s with respect to its initial value as the index to show the influence of particle-size segregation, and a greater change in N-s corresponds to a higher impact force and a higher action point. The greater change of N-s corresponds to a lower energy dissipation, which is accounted for by the friction among the particles in the flow process, i.e.,less contacts among the particles correspond to the less dissipation of energy, which means that more energy can be converted into impact force. (C) 2018 Elsevier B.V. All rights reserved.
KeywordParticle-size segregation Dry granular flow Impact force Action point
DOI10.1016/j.powtec.2018.09.014
Indexed BySCI
WOS KeywordFREE-SURFACE FLOWS ; SNOW AVALANCHES ; RIGID BARRIER ; SIMULATION ; WAVES ; WALL
Language英语
Quartile2区
Funding ProjectNational Natural Science Foundation of China[41502334] ; National Natural Science Foundation of China[41877524] ; 135 Strategic Program of the Institute of Mountain Hazards and Environment, CAS[SDS-135-1705] ; 135 Strategic Program of the Institute of Mountain Hazards and Environment, CAS[SDS-135-1704]
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WOS Research AreaEngineering
WOS SubjectEngineering, Chemical
WOS IDWOS:000449242200006
Funding OrganizationNational Natural Science Foundation of China ; 135 Strategic Program of the Institute of Mountain Hazards and Environment, CAS
PublisherELSEVIER SCIENCE BV
Citation statistics
Cited Times:9[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/24375
Collection山地灾害与地表过程重点实验室
Corresponding AuthorFan, Xiao-Yi
Affiliation1.Chinese Acad Sci, Inst Mt Hazards & Environm, 9,Sect 4,RenMinNanLu Ave, Chengdu 610041, Sichuan, Peoples R China
2.Southwest Univ Sci & Technol, Sch Civil Engn & Architecture, Mianyang, Sichuan, Peoples R China
3.Shock & Vibrat Engn Mat & Struct Key Lab Sichuan, Mianyang, Sichuan, Peoples R China
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Jiang, Yuan Jun,Fan, Xiao-Yi,Li, Tian-Hua,et al. Influence of particle-size segregation on the impact of dry granular flow[J]. POWDER TECHNOLOGY,2018,340:39-51.
APA Jiang, Yuan Jun,Fan, Xiao-Yi,Li, Tian-Hua,&Xiao, Si-You.(2018).Influence of particle-size segregation on the impact of dry granular flow.POWDER TECHNOLOGY,340,39-51.
MLA Jiang, Yuan Jun,et al."Influence of particle-size segregation on the impact of dry granular flow".POWDER TECHNOLOGY 340(2018):39-51.
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