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Abstract There are a kind of special geological hazard body as namely as frost weathering debris flow in cold mountains in western China. When the projects are built on the accumulation body with large volume or nearby it，it will have great effect on the projects. Taking the five large-scale debris flow accumulation bodies developed along Zhongbo reach of Yuqu River in Tibet as the study objects，we consider that the frost weathering debris flow is a bedrock denudation phenomenon based on engineering geological mapping，analysis of areal geology and collecting of meteorological data，and so on. Its formation is closely related to the particular climate，topography，lithology，structure and earthquake，and so on. and it is gradually accumulated through a few hundred thousand to a few million years. By considering the characteristics of the debris flows accumulation body such as big scale，distribution in groups，bad stability，continuous falling of blocks in the source area，the preventive measures including avoiding and monitoring in some large-scale projects such as Yunnan—Tibet Railway and Zhongbo Hydropower Station are investigated. The results can provide technical support for the project construction and reference for the similar projects.
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2011, Vol. 30 
