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中南大学学报(自然科学版)

Journal of Central South University

第50卷    第3期    总第295期    2019年3月

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文章编号:1672-7207(2019)03-0712-07
非饱和粗粒土基质吸力与含水率及级配关系试验研究
何忠明1, 2,刘雅欣2,曾新发3,刘登生4,职孟林5

(1. 长沙理工大学 公路养护技术国家工程实验室,湖南 长沙,410014;
2. 长沙理工大学 交通运输工程学院,湖南 长沙,410014;
3. 湖南城市学院 土木工程学院,湖南 益阳,413000;
4. 中交(天津)生态环保设计研究院有限公司,天津,300450;
5.河南省交通规划勘察设计院,河南 郑州,450000
)

摘 要: 为了研究非饱和粗粒土基质吸力与含水率及级配之间的关系,通过控制曲率系数和不均匀系数配制5种不同级配的粗粒土土样,采用自行设计的模型装置进行降雨入渗试验,并根据试验结果绘制基质吸力与含水率关系拟合曲线,得到满足试验条件的函数关系式,从而得到土-水特征曲线方程。研究结果表明:不均匀系数越大,土样初始含水率越小,达到饱和状态时含水率越小,且土样达到饱和所需的时间越长;随着脱水过程的进行,土样不均匀系数越大,其含水率的下降速度越慢,残余含水率也越大;初始基质吸力随着土样不均匀系数增大而不断提高,同时,土样的残余基质吸力随着不均匀系数增大而增大;利用Van Genuchten模型对实测土-水特征曲线进行拟合可获得拟合参数,从而得到可应用于数值分析的土-水特征曲线方程。

 

关键词: 粗粒土;级配;基质吸力;含水率;土水特征曲线

Experimental study on relationship among matric suction and moisture content and gradation of unsaturated coarse grained soil
HE Zhongming1, 2, LIU Yaxin2, ZENG Xinfa3, LIU Dengsheng4, ZHI Menglin5

1. State Engineering Laboratory of Highway Maintenance Technology,
Changsha University of Science & Technology, Changsha 410014, China;
2. School of Traffic and Transportation Engineering, Changsha University of Science & Technology,
Changsha 410014, China;
3. College of Civil Engineering, Hunan City University, Yiyang 413000, China;
4. China Communications(Tianjin) Environmental Protection Design and Research Institute Co. Ltd.,
Tianjin 300450, China;
5. Communications Planning and Design Institute Co. Ltd of Henan Province, Zhengzhou 450000, China

Abstract:In order to study the relationship among matric suction and moisture content and gradation of unsaturated coarse grained soil, five kinds of coarse-grained soil samples with different gradations were prepared by controlling curvature coefficient and non-uniform coefficient. The rainfall infiltration test was conducted using a self-designed model device. The fit curves of moisture content with matrix suction were plotted based on the experimental results, and the functional relationship under the experimental conditions was obtained. The results show that the bigger the non-uniform coefficient, the smaller the initial moisture content of the soil sample, and the smaller the water content, the longer it takes for the soil sample to reach saturation. With the progress of the dehydration process, the larger the non-uniform coefficient of the soil sample, the slower the rate of decline of its moisture content, and the greater the final residual moisture content. The initial matrix suction increases with the increase of the non-uniform coefficient of the soil sample. The residual matrix suction of the soil sample increases with the increase of the non-uniform coefficient. Using the Van Genuchten model to fit the measured soil-water characteristic curve, the fitting parameters can be obtained, so that the empirical equation of the soil-water characteristic curve applied in the numerical analysis process can be obtained.

 

Key words: coarse grained soil; gradation; matric suction; water content; soil water characteristic curve

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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