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工程科学与技术:2015,47(6):49-53
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泥石流多发区典型土浆体流变特性比较研究
(1.云南大学国际河流与生态安全研究院;2.中国科学院水利部成都山地灾害与环境研究所;3.云南省地质环境监测院)
A Comparative Study on the Typical Soil Slurry Rhelogical Properties of Prone Area of Debris Flow
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投稿时间:2015-04-22    修订日期:2015-06-17
中文摘要: 泥石流浆体流变特性及其影响因素是泥石流动力学研究的重要内容,为探讨泥石流多发区典型细粘土浆体流变特性,选取云南小江流域和甘肃白龙江流域的典型土,通过流变实验、颗粒级配实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。结果显示随着容重的增加,红、黄土泥石流浆体的剪切应力、屈服应力和刚度系数均呈现出增长的趋势,在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、粘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。研究结果对揭示两个区域的泥石流成灾机理具有一定的意义。
Abstract:The slurry rheological properties of debris flow and its impact factors are major content of debris flow dynamics research. To study typical fine clay Rhelogical Properties of Prone Area of debris flow, this research selected typical soil of Xiao River basin in Yunnan province and the Bailong River in Gansu province. With rheological experiment, particle size experiment and mineral composition analysis method, it compared and studied the debris flow slurry rheological properties and its impact factors on red soil of Xiao River and yellow soil of Malan, Bailong River. 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 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 research findings are hopefully of help to reveal the mechanism of debris flow hazard in the two areas.
文章编号:201500374     中图分类号:    文献标志码:
基金项目:“怒江流域高山峡谷区泥石流活动性定量研究”(41301595)
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黄江成,欧国强,潘华利,吕娟,祝传兵.泥石流多发区典型土浆体流变特性比较研究[J].工程科学与技术,2015,47(6):49-53.
huangjiangcheng,Pan huanli.A Comparative Study on the Typical Soil Slurry Rhelogical Properties of Prone Area of Debris Flow[J].Advanced Engineering Sciences,2015,47(6):49-53.