IMHE OpenIR  > 成都山地所知识仓储(2009年以前)
Alternative TitleStudy on Process and Mechanism of Landslides translating to Debris Flows inJiangjia Ravine, Yunnan Province
Thesis Advisor崔鹏
Degree Grantor中国科学院研究生院
Place of Conferral北京
Degree Name博士
Degree Discipline自然地理学
Keyword蒋家沟 滑坡 泥石流 砾石土 孔隙率 孔隙水压力 转化机理


Other Abstract

Landslide translating to debris flows is the frontier problem in the study of mechanism of debris flow formation, it has theatrical and practical significance, it is important for debris flow forecasting. In this dissertation, the study area is Jiangjia Ravine, through simulation rainfall experiments on the landslides in Jiangjia Ravine and durative observation in the upstream area, the influence of rainstorm infiltration and the characteristic of the gravel soil in the Jiangjia Ravine on the process of landslides translating to debris flows is analyzed, and the mechanism of landslides translating to debris flows in Jiangjia Ravine is revealed. Most of the landslides in Jiangjia Ravine are composed of gravel soil, the porosity of the gravel soil influence the failure and translating process of landslides fundamentally: 1. The strength indexes of gravel soil vary at different porosity. With the increase of gravel soil porosity, the cohesion and internal friction angle decrease. 2. The saturated hydraulic conductivity and the stable infiltration rate decrease with the increase of gravel soil porosity. 3. For landslides composed of dense gravel soil, such as the bank slopes formed of archaic debris flow deposits or late debris flow deposits, the pore water pressure -develops slowly, and the value is low during infiltration process, also the water content is not high of the landslides, so often the forepart of the landslides collapses a bit, and it is difficult to translate to debris flow directly. The landslides composed of loose gravel soil behave different from that composed of dense soil, under the condition of durative rainstorm, the pore water pressure of the soil in shallow layer of landslides rise sharply after some time, and the gravel soil liquefied and translating to debris flows directly. In the upstream area of Jiangjia Ravine, short duration rainstorm can form floods and debris flows in branch gullies; the floods and debris flows scour and undermine the foot of landslides beside branch gullies, down cut the gully bed, and result in many collapses of bank slopes, this can replenish debris flows in the gully, it can also form loose solid material in the gully, considering the difference of strength indexes between loose gravel soil and dense gravel soil, this is very important for the frequent eruption of debris flows in Jiangjia Ravine.

Document Type学位论文
Recommended Citation
GB/T 7714
冯自立. 云南蒋家沟滑坡转化为泥石流观测实验研究[D]. 北京. 中国科学院研究生院,2005.
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