- 责任者：Xie Kai (China University of Geosciences ; Wuhan 430074 ; China) ; Yu Hongming
- 刊名：Journal of Mountain Research
- 出版年：2013
- 卷期：31(6)
- 关键词：泥石流 ; debris flows ; 河南 ; Henan Province
- 页码：p.738-744
- 图表：8 illus., 1 table, 12 refs.
- 分类号：1702
- issnNo：ISSN1008-2786
- isbnNo：CN51-1516/P
Most of debris flows are rainfall induced in Luanchuan of Henan, China. The rainfall has a greater im- pact on the strength of debris flow source region soil. The soil samples of natural debris flow（Gullies, Hillslopes） and artificial debris flow （Slag） in Luanchuan are tested with large scale direct shear apparatus under the condition of natural water content, rapid saturation and saturation for 3 hours. The relationship between c, ~p, strength enve- lope and water content, and the relationship between shearing stress and horizontal displacement under the condi- tion of different water content are obtained. The results show that, excepting the c of soil sample of slag with little clay tending to be 0, the ~ of slag sample and other soil samples＇ c and ~p are decreased under the condition of wa- ter content from nature to saturation. The curve of shear stree-horizontal displacement has a obvious fluctuation in saturated condition. After saturated for 3 hours, the shear strength of the soil samples has a slight reduction. A cer- tain condition of antecedent precipitation contributes a lot to the occurrence of debris flow. With ,the adequate ante- cedent precipitation, debris flow source region sc, il saturate rapidly, and shear strength has a significant drop that the soil is damaged by the action of gravity and erosion of runoff, taken away by surface water flow. As the rain continues, the shear strength of soil further reduces, and the risk of debris flow occurrence increases. Finally, deb- ris flow start-up with different types of solid source materials is comprehensive analyzed.