摘要
为探讨泥石流多发区典型细黏土浆体流变特性,选取云南小江流域和甘肃白龙江流域典型土,通过流变试验、颗粒级配试验和矿物组分分析方法,比较分析小江红土和白龙江马兰黄土的泥石流浆体流变特性及其影响因素。结果显示:随容重增加,红、黄土泥石流浆体的剪切应力、屈服应力和刚度系数均呈增长的趋势,高容重条件下增长较为明显;同容重条件下,红土浆体的剪切应力、屈服应力和刚度系数均明显高于黄土浆体,其中红、黄土浆体屈服应力与体积浓度呈指数相关;红、黄土浆体流变特性以容重的影响最为显著;此外,颗粒级配、黏粒含量和矿物组成及其含量也是造成红、黄土流变特性差异的重要原因。研究结果对揭示2个区域的泥石流成灾机理具有一定的意义。
The slurry rheological properties of debris flow and its impact factors are major content of debris flow dynamics research. In order to study rhelogical properties of typical fine clay in the prone area of debris flow,the debris flow slurry rheological properties and its impact factors of the red soil of Xiao River and the yellow soil of Malan,Bailong River were studied and compared with rheological experiment,particle size experiment and mineral composition analysis method. It was found that along with the increase of density,shearing stress,yield stress and stiffness index of both red and yellow soil indicated a trend of growth,with more obvious growth range under high density. Besides,under the condition of the same density,the three indicators of red soil were significantly higher than that of the yellow soil. Also the shearing stress of red and yellow soil in index correlated to the volume concentration. For red and yellow slurry rheological properties,the impact of density was most significant. In addition,it was discovered that the grain size distribution,clay granule contents,mineral composition and its content were the important causes for the differences of red and yellow soil rheological properties as well. The results could be used to reveal the mechanism of debris flow hazard in the two areas.
出处
《四川大学学报（工程科学版）》
EI
CAS
CSCD
北大核心
2015年第6期49-53,共5页
Journal of Sichuan University (Engineering Science Edition)
基金
国家自然科学基金资助项目(41301595)
关键词
白龙江黄土
小江红土
泥石流浆体
流变特性
典型土
Bailong River yellow soil
Xiao River red soil
debris flow slurry
rheological behavior
typical soil
