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Threshold criterion for debris flow initiation in seasonal gullies

International Journal of Sediment Research 2017年第2期32卷 231-239页

作者： Yang Wang Peng Cui Zhaoyin Wang Shuangqing Liang Key Laboratory of Mountain Hazards and Earth Surface Processes/Institute of Mountain Hazards and Environment CAS University of Chinese Academy of Sciences CAS Center for Excellence in Tibetan Plateau Earth Sciences Department of Hydraulic Engineering Tsinghua University

A series of flume experiments were done to investigate the effect of grain composition on the critical gradient and discharge of debris flows initiated in seasonal *** results indicated that the critical gradient and discharge for debris flow initiation decrease initially,and then increase as the mass content of fine particles(debris flow *** critical discharge model considering the effect of non-homogeneity of the soil and the size of coarse and fine grains provides a more accurate prediction of debris flow initiation than other models based on the mean diameter.

关键词： Grain composition Seasonal gully Non-uniform sediment debris flow initiation Critical gradient Critical discharge

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Experimental study on the moving characteristics of fine grains in wide grading unconsolidated soil under heavy rainfall

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Journal of Mountain Science 2017年第3期14卷 417-431页

作者： CUI Yi-fei ZHOU Xiao-jun GUO Chao-xu Department of Civil and Environmental Engineering Hong Kong University of Science and TechnologyClear Water BayHong KongChina China Merchants Chongqing Communications Research&Design Institute Chongqing 400067China Fujian Academy of Building Research Pujian Key Laboratory of Green Building TechnologyFuzhou 350025China Fuzhou University Fuzhou 350108China

The initiation mechanism of debris flow is regarded as the key step in understanding the debrisflow 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 factors of 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 particleaccumulation. 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 layer and 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.

关键词： Wide grading unconsolidated soil Fine particle migration Soil failure Landslide debris flow initiation Flume test Heavy rainfall

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