西藏林芝地区冰川降雨型泥石流起动实验初步研究

doi:10.13722/j.cnki.jrme.2014.0450

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Abstract In recent years，with the global temperatures rising，the frequency of debris flow breakout events has increased，which includes glacial-rainfall type debris flow disasters in Tibet region. This paper will set the glacial- rainfall debris flow gully in Nyingchi of Tibet area as the research object，by observing the vary characteristics of water levels，pore water pressure in the starting process for the first time to get the relationship and its starting characteristics by water levels，pore water pressure，the slope，and the thickness of accumulation. By similar physical experiments，relationship of the experimental parameters among flow rate，flow depth，velocity and the slope，thickness of debris flow accumulation，the vary relationship of water level and pore water pressure are analyzed，according to the time relationship of the water level，pore water pressure under different test conditions，we could define the glacial-rainfall type debris flow starting process，which consists of early stage of saturated phase，starting phase and accumulation stage. The experimental results of flow depth，velocity are consistent with the field observation results of typical glacial debris flow in the study area，which are obtained by ratio of similitude provides the reference for the glacial-rainfall type debris flow study in research area.

Key words： soil mechanics Nyingchi area glacial-rainfall type debris flow physical experiment pore water pressure water levels

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2014.0450 OR https://rockmech.whrsm.ac.cn/EN/Y2015/V34/Is1/3256

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