【摘要】 我国西部高寒山区发育一种特殊的地质灾害体——寒冻风化碎屑流。在规模较大的堆积体及其邻近区域开展工程建设时,对工程影响较大。以西藏玉曲河中波河段发育的5处大型碎屑流堆积体为研究对象,基于工程地质测绘、区域地质分析、气象资料收集等工作,认为寒冻风化碎屑流是一种基岩剥蚀现象,其形成与特殊的气候、地形、岩性、构造和地震等条件密切相关,是经过几十万年甚至上百万年历史逐渐堆积而成的。结合碎屑堆积体规模大、分布成群、稳定性差、物源区岩块不断崩落等特点,探讨研究区重大工程项目(滇藏铁路、中波水电站等)宜采取的防治措施(如避让、监测等)。研究结果为辖区工程建设提供技术依据,对类似工程提供技术参考。更多还原

【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.更多还原