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有机质和黏土矿物对软土流变性质影响对比试验研究
引用本文:谷任国,房营光.有机质和黏土矿物对软土流变性质影响对比试验研究[J].华南理工大学学报(自然科学版),2008,36(10).
作者姓名:谷任国  房营光
作者单位:华南理工大学,亚热带建筑科学国家重点实验室,广东,广州,510640
基金项目:中国博士后科学基金资助项目
摘    要:采用改进的直剪蠕变仪,对有机质、膨润土对软土流变性质影响显著程度进行对比试验研究,在相同试验条件下完成了两组含有机质、膨润土百分比相同的试样的流变性质的测试。测试结果表明,有机质和膨润土所含蒙脱石是影响软土流变性质的重要因素之一,且有机质对软土流变性质的影响较膨润土所含蒙脱石的影响显著,在其他条件相同时,含有机质或膨润土试样的黏滞系数均比不含有机质和膨润土试样的小,且含有机质试样的黏滞系数比含膨润土试样的小,即有机质和膨润土使土样流变变形阻力减小,且前者使土样流变变形阻力减少的幅度较后者的大。试验结果分析认为,有机质和膨润土所含蒙脱石通过吸附于颗粒表面的结合水影响土的流变性质,其中强结合水是土体产生流变的主要因素,而弱结合水则是相对次要因素。文中的试验结果有助于进一步认清土体流变的起因,对改进和完善现有流变变形计算理论有一定指导意义。

关 键 词:有机质  黏土矿物  软土  结合水  流变试验  
收稿时间:2007-10-8
修稿时间:2008-3-10

Comparative Experiment Study on the Effects of Organic Matter and Clayey Mineral on Rheological Characteristics of Soft Soil
Gu Ren-guo,Fang Ying-guang.Comparative Experiment Study on the Effects of Organic Matter and Clayey Mineral on Rheological Characteristics of Soft Soil[J].Journal of South China University of Technology(Natural Science Edition),2008,36(10).
Authors:Gu Ren-guo  Fang Ying-guang
Abstract:By utilizing an improved direct shear creep apparatus, comparative experiment on the effects of orgnic matter and Bentonite on rheological characteristics of soft soil is performed, and creep characteristics of two sets of soft soil samples with the same contents of organic matter and Bentonite, respectively, are tested under the same test conditions. The test results show that organic matter and Bentonite are two key factors on behavior of soil creep, and the influence of the former is more notable than the influence of the latter. The viscosity coefficient of the soft soil sample with the content of organic matter or Bentonite is less than that of the soft soil sample with no content of organic matter and Bentonite ,and the viscosity coefficient of the sample with the content of organic matter is less than that of the sample with the content of Bentonite. It means that organic matter and Bentonite lead to the decrease of creep strain resistance, and the decrease amount caused by the former is more than that caused by the latter. It is concluded that orgnic matter and Bentonite affects soil rheology characteristics by the way of water bounded soil particle surface, furthermore, firmly bound water is a key factor and loosely bound water is only a secondary factor. The test results have contribution to understanding of the origins of soil rheology and are of guiding significance for improvement and perfection on existing computing theories of rheology deformation of soft soil.
Keywords:organic matter  clayey mineral  soft soil  adsorbed water  rheology tests
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