| 摘要: |
| 颗粒级配是影响土-水特征曲线的主要因素之一，探讨这个问题对研究非饱和土的渗流和强度特性具有重要价值。以江西红土为研究对象，人工配制5组颗粒级配不同的土样，基于分形理论研究其分形特征及其分维数，结合滤纸法试验测量土样的土-水特征曲线并求得其特征值，然后分析各特征值与分维数之间的关系。结果表明：对于不同颗粒级配的土-水特征曲线，同一体积含水率下细土颗粒含量越多的土样其基质吸力越大；粗细土颗粒含量不同的土样均具有较好的分形特征；颗粒级配定量指标均随分维数的增加呈现出先增后减的规律；且分维数随着细粒土含量的减少而降低，进气值和残余基质吸力值均随分维数的增大而提高。说明可运用分维数讨论颗粒级配对土-水特征曲线的影响。 |
| 关键词: 分形理论 颗粒级配 滤纸法 土－水特征曲线 分维数 |
| DOI： |
| 分类号:TU411 |
| 基金项目:国家自然科学基金资助项目（51268046; 51468041）； 江西省自然科学基金资助项目（20151BAB203037; 20161BAB206126） |
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| Influences of different grain size contents on soil-water characteristic curve of unsaturated laterite based on fractal theory |
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LIU Xingzhi, WU Yue, PAN Shiting, LIU Xiaowen, GU Minghan
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School of Civil Engineering and Architecture， Nanchang University, Nanchang
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| Abstract: |
| The contents of different particle sizes in soil are one of the main factors that affect the soil-water characteristic curve. It is of great practical value to study and analyze the seepage and strength problems of the unsaturated soil. In this paper, taking the laterite in Jiangxi Province as the research object, the soil samples having different contents of coarse and fine particles are prepared in five groups. And some studies of the fractal characteristics and fractal dimension D of the fractal theory are carried out on the basis of the fractal theory. The soil-water characteristic curves of soil samples are measured by filter paper method, and their characteristic values have been obtained. Then, the relationship between the characteristic values and the fractal dimension D is discussed and analyzed. The relevant testing with analysis results shows that for the soil-water characteristic curves with different particle size distributions, the greater the soil matrix suction of the soil samples with the same volume moisture content, the greater the fine soil matrix suction. The soil samples with different soil particle sizes have better fractal characteristics. It is feasible to analyze the influences of the particle size on the soil-water characteristic curves by the fractal dimension D. The quantitative indexes of the gradation of grain, Cu and Cc, show the law of increasing first and then decreasing with the increase of the fractal dimension D. And the fractal dimension D will decrease with the decrease of the fine soil content, and both the inlet values and the residual matrix suction values will increase with the increase of the fractal dimension D. |
| Key words: fractal theory particle content filter paper method SWCC fractal dimension |
