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  4. Journal of Mountain Science
  5. Journal of Mountain Science-2012
  6. Vol9 No.2
A simple lumped mass model to describe velocity of granular flows in a large flume

文献类型：期刊论文

作者Yang Qingqing1; Cai Fei1; Ugai, Keizo1; Su Zhiman2; Huang Runqiu3; Xu Qiang3
刊名JOURNAL OF MOUNTAIN SCIENCE
出版日期2012-04-01
卷号9期号:2页码:221-231
关键词Granular flow Large-scale flume test Mass-front velocity Deposit characteristic
ISSN号1672-6316
通讯作者CAI Fei
英文摘要This paper presents a lumped mass model to describe the run-out and velocity of a series of large flume tests, which was carried out to investigate some propagation mechanisms involved in rapid, dry, dense granular flows and energy transformation when the flows encountered obstacles and reoriented their movement directions. Comparisons between predicted and measured results show that the trend of predicted velocities was basically matched with that of measured ones. Careful scrutiny of test videos reveals that subsequent particles with a higher velocity collided with slowed fronts to make them accelerate. However, this simple model cannot reflect collisions between particles because it treated released materials as a rigid block. Thus, the predicted velocity was somewhat lower than the measured velocity in most cases. When the flow changed its direction due to the variation in slope inclination, the model predicted a decrease in velocity. The predicted decrease in velocity was less than the measured one within a reasonable range of 10% or less. For some cases in which a convexity was introduced, the model also predicted the same trend of velocities as measured in the tests. The velocity increased greatly after the materials took a ballistic trajectory from the vertex of the convexity, and reduced dramatically when they finally made contact with the base of the lower slope. The difference between prediced and measured decrease in velocity was estimated to be about 5% due to the landing. Therefore, the simple lumped mass model based on the energy approach could roughly predict the run-out and velocity of granular flows, although it neglected internal deformation, intergranular collision and friction.
WOS标题词Science & Technology ; Life Sciences & Biomedicine
类目[WOS]Environmental Sciences
研究领域[WOS]Environmental Sciences & Ecology
关键词[WOS]5.12 WENCHUAN EARTHQUAKE ; INDUCED SLOPE FAILURE ; ROCK AVALANCHES ; ENERGY APPROACH ; LANDSLIDES ; TESTS ; PREDICTIONS ; GRAVEL ; SCALE
收录类别SCI
语种英语
WOS记录号WOS:000301788100009
公开日期2013-04-15
源URL[http://192.168.143.20:8080/handle/131551/5082]  
专题成都山地灾害与环境研究所_Journal of Mountain Science _Journal of Mountain Science-2012_Vol9 No.2
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
作者单位1.Gunma Univ, Dept Civil & Environm Engn, Kiryu, Gumma 3768515, Japan
2.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu 610041, Peoples R China
3.Chengdu Univ Technol, State Key Lab Geohazard Prevent & Geoenvironm Pro, Chengdu 610059, Peoples R China
推荐引用方式
GB/T 7714		 Yang Qingqing,Cai Fei,Ugai, Keizo,et al. A simple lumped mass model to describe velocity of granular flows in a large flume[J]. JOURNAL OF MOUNTAIN SCIENCE,2012,9(2):221-231.
APA Yang Qingqing,Cai Fei,Ugai, Keizo,Su Zhiman,Huang Runqiu,&Xu Qiang.(2012).A simple lumped mass model to describe velocity of granular flows in a large flume.JOURNAL OF MOUNTAIN SCIENCE,9(2),221-231.
MLA Yang Qingqing,et al."A simple lumped mass model to describe velocity of granular flows in a large flume".JOURNAL OF MOUNTAIN SCIENCE 9.2(2012):221-231.

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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