Empirical model for assessing dynamic susceptibility of post-earthquake debris flows
文献类型：会议论文
| 作者 | Hu, Kaiheng1,2 ; Wang, Zhang1,2,3; Chen, Cheng1,2,3; Li, Xiuzhen1,2
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| 出版日期 | 2019 |
| 会议日期 | June 10, 2019 - June 13, 2019 |
| 会议地点 | Golden, CO |
| 关键词 | Buoyancy Confined flow Debris Drag Granular materials Hazards Particle size Segregation (metallography) Shear flow Surface segregation |
| DOI | 10.25676/11124/173119 |
| 页码 | 973-980 |
| 国家 | United states |
| 英文摘要 | Particle 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. |
| 源文献作者 | Access Limited Construction ; Association of Environmental and Engineering Geologists ; BGC Engineering Inc. ; et al. ; Geobrugg North America ; KANE Geotech Inc. |
| 产权排序 | 1 |
| 会议录 | Debris-Flow Hazards Mitigation: Mechanics, Monitoring, Modeling, and Assessment - Proceedings of the 7th International Conference on Debris-Flow Hazards Mitigation
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| 语种 | 英语 |
| URL标识 | 查看原文 |
| ISBN号 | 9780578510828 |
| 源URL | [http://ir.imde.ac.cn/handle/131551/33788]  |
| 专题 | 成都山地灾害与环境研究所_山地灾害与地表过程重点实验室 |
| 通讯作者 | Hu, Kaiheng |
| 作者单位 | 1.Institute of Mountain Hazards and Environment, Chinese Academy of Sciences and Ministry of Water Conservancy, Chengdu, Sichuan; 610041, China; 2.Key Laboratory of Mountain Hazards and Earth Surface Processes, Chinese Academy of Sciences, Chengdu, Sichuan; 610041, China; 3.University of Chinese Academy of Sciences, Beijing; 100049, China |
| 推荐引用方式 GB/T 7714 | Hu, Kaiheng,Wang, Zhang,Chen, Cheng,et al. Empirical model for assessing dynamic susceptibility of post-earthquake debris flows[C]. 见:. Golden, CO. June 10, 2019 - June 13, 2019. |
入库方式： OAI收割
来源：成都山地灾害与环境研究所
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