【作者】 刘中港； 王恩志； 刘晓丽； 陈阳；

【Author】 LIU Zhonggang;WANG Enzhi;LIU Xiaoli;CHEN Yang;State Key Laboratory of Hydroscience and Engineering,Tsinghua University;

【机构】 清华大学水沙科学与水利水电工程国家重点实验室；

【摘要】 起动是泥石流研究的关键问题之一。本文采用十字板剪切流变实验方法,在研究物源变形、速率和加速度基础上,提出具有物理意义的泥石流起动过程的定义。据此可以准确确定起动过程,在此基础之上分析泥石流起动过程特征,进一步分析泥石流起动机理。实验结果显示泥石流的起动过程随着速度增加,阻力衰减,孔隙水压力升高。根据实验结果和其他学者的研究成果,提出泥石流起动是土体碎裂化、剪切稀化和液化3种综合效应的结果。更多还原

【Abstract】 Initiation is one of the key problems of debris flow study.It is studied in this paper by the Vane rheometer which is a new apparatus for debris flow study,by which the stain,strain rate and strain acceleration are analyzed.Based on those analysis,the debris flow initiation process is defined.The initiation characteristics will be demonstrated after the initiation process was distinguished from others by this definition.In turn the debris flow initiation mechanism will be explained by the experiment results which show that resistance decreases and pore water presses increase during the acceleration process.Initiation mechanism can be explained as the results of debris effect,shear thinning and liquefaction by the experiment results combined with others studies.更多还原