IMHE OpenIR  > Journal of Mountain Science  > Journal of Mountain Science-2017  > Vol14 No.3
Experimental study on the moving characteristics of fine grains in wide grading unconsolidated soil under heavy rainfall
CUI Yi-fei; ZHOU Xiao-jun; GUO Chao-xu
Corresponding AuthorCUI Yi-fei
2017-03
Source PublicationJournal of Mountain Science
ISSN1672-6316
Volume14Issue:3Pages:417-431
Subtype期刊论文
AbstractThe initiation mechanism of debris flow is regarded as the key step in understanding the debris-flow processes of occurrence, development and damage. Moreover, migration, accumulation and blocking effects of fine particles in soil will lead to soil failure and then develop into debris flow. Based on this hypothesis and considering the three factorsof slope gradient, rainfall duration and rainfall intensity, 16 flume experiments were designed using the method of orthogonal design and completed in a laboratory. Particle composition changes in slope toe, volumetric water content, fine particle movement characteristics and soil failure mechanism were analyzed and understood as follows:the soil has complex, random and unstable structures, which causes remarkable pore characteristics of poor connectivity, non-uniformity and easy variation. The major factors that influence fine particle migration are rainfall intensity and slope. Rainfall intensity dominates particle movement, whereby high intensity rainfall induces a large number of mass movement and sharp fluctuation, causing more fine particles to accumulate at the steep slope toe. The slope toe plays an important role in water collection and fine particle accumulation. Both fine particle migration and coarse particle movement appears similar fluctuation. Fine particle migration is interrupted in unconnected pores, causing pore blockage and fine particle accumulation, which then leads to the formation of a weak layerand further soil failure or collapses. Fine particle movement also causes debris flow formation in two ways: movement on the soil surface and migration inside the soil. The results verify the hypothesis that the function of fine particle migration in soil failure process is conducive for further understanding the formation mechanism of soil failure and debris flow initiation.
KeywordWide Grading Unconsolidated Soil Fine Particle Migration Soil Failure Landslide Debris Flow Initiation Flume Test Heavy Rainfall
DOI10.1007/s11629-016-4303-x
Indexed BySCI
Language英语
Citation statistics
Cited Times:63[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/18431
CollectionJournal of Mountain Science_Journal of Mountain Science-2017_Vol14 No.3
山地灾害与地表过程重点实验室
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GB/T 7714
CUI Yi-fei,ZHOU Xiao-jun,GUO Chao-xu. Experimental study on the moving characteristics of fine grains in wide grading unconsolidated soil under heavy rainfall[J]. Journal of Mountain Science,2017,14(3):417-431.
APA CUI Yi-fei,ZHOU Xiao-jun,&GUO Chao-xu.(2017).Experimental study on the moving characteristics of fine grains in wide grading unconsolidated soil under heavy rainfall.Journal of Mountain Science,14(3),417-431.
MLA CUI Yi-fei,et al."Experimental study on the moving characteristics of fine grains in wide grading unconsolidated soil under heavy rainfall".Journal of Mountain Science 14.3(2017):417-431.
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