[1]张镇飞,倪万魁,王熙俊,等.压实黄土水分入渗规律及渗透性试验研究[J].水文地质工程地质,2019,46(06):97-104.[doi:10.16030/j.cnki.issn.1000-3665.2019.06.13]
 ZHANG Zhenfei,NI Wankui,WANG Xijun,et al.An experimental study of water infiltration and hydraulic conductivity of the compacted loess[J].Hydrogeology & Engineering Geology,2019,46(06):97-104.[doi:10.16030/j.cnki.issn.1000-3665.2019.06.13]
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压实黄土水分入渗规律及渗透性试验研究()
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《水文地质工程地质》[ISSN:1000-3665/CN:11-2202/P]

卷:
46卷
期数:
2019年06期
页码:
97-104
栏目:
工 程 地 质
出版日期:
2019-11-15

文章信息/Info

Title:
An experimental study of water infiltration and hydraulic conductivity of the compacted loess
文章编号:
1000-3665(2019)06-0097-08
作者:
张镇飞1倪万魁1王熙俊1苑康泽1潘登丽1刘魁2
1.长安大学地质工程与测绘学院,陕西 西安710054;2.信息产业部电子综合勘察研究院,陕西 西安710000
Author(s):
ZHANG Zhenfei1 NI Wankui1 WANG Xijun1 YUAN Kangze1 PAN Dengli1 LIU Kui2
1.School of Geology Engineering and Geomatics, Chang’an University, Xi’an, Shaanxi710054, China;2.China Electronic Research Institute of Engineering Investigations and Design, Xi’an, Shaanxi710000, China
关键词:
压实黄土垂直入渗瞬时剖面法土-水特征曲线非饱和渗透系数
Keywords:
compacted loess vertical infiltration instantaneous profile method soil-water characteristic curve unsaturated hydraulic conductivity
分类号:
TU411.4
DOI:
10.16030/j.cnki.issn.1000-3665.2019.06.13
文献标志码:
A
摘要:
为了研究压实黄土中的水分垂直入渗规律和非饱和渗透系数函数,在实验室内利用一维土柱垂直入渗模型试验装置,对两组压实黄土土柱试样分别进行了常水头入渗和降雨入渗试验。得到主要结论如下:(1)常水头入渗试验中,累积入渗量和湿润锋前进距离都随入渗时间呈幂函数形式增长,累积入渗量和湿润锋前进距离之间存在线性关系。入渗率在入渗初期最大,之后随入渗时间而快速降低,并在土柱试样底部出水以后达到稳定,且与湿润锋前进距离呈反比关系。(2)降雨入渗试验中,得到两组试样入渗过程中土-水特征曲线数据,分别用van Genuchten模型和Fredlund-Xing模型对两组试样进行了特征曲线拟合。并利用瞬时剖面法处理了入渗过程中水分和水势传感器的监测数据,得到两组试样的非饱和渗透系数,并拟合得到非饱和渗透系数与体积含水率之间的指数函数关系式。同时,采用van Genuchten和Fredlund等渗透系数模型分别对两组试样的非饱和渗透系数进行预测,通过对比模型预测结果和瞬时剖面法实测值,发现van Genuchten渗透系数模型预测结果更接近实测值。
Abstract:
In order to study the water vertical infiltration and the unsaturated hydraulic conductivity function of the compacted loess, two groups of infiltration tests are conducted on the unsaturated compacted loess columns in the laboratory. In the constant-water head infiltration tests, both the cumulative infiltration and the wetting front distance are in a good power function relationship with time. A linear correlation exists between the cumulative infiltration and the wetting front distance. The infiltration rate, which is inversely proportional to the wetting front distance, decreases rapidly with time after the initial infiltration and finally reaches a steady seepage. In the rainfall infiltration tests, the van Genuchten and Fredlund-Xing equations are used to model the soil-water characteristic curve (SWCC) for each soil. Both the models capture the curve reasonably well over the entire range of the measured suction. The unsaturated hydraulic conductivity calculated using the instantaneous profile method has an exponential relation to the volumetric water content. Meanwhile, the van Genuchten and the Fredlund statistical modeling formalism are used to predict the hydraulic conductivity function, respectively. By comparison, the predicted values of the van Genuchten hydraulic conductivity model are much closer to the experimental values.

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备注/Memo

备注/Memo:
收稿日期: 2019-03-30; 修订日期: 2019-07-08
基金项目: 陕西省重点研发计划项目(2019ZDLSF05-07)
第一作者: 张镇飞(1991-),男,硕士研究生,主要从事非饱和土力学研究。E-mail:1048431093@qq.com
通讯作者: 倪万魁(1965-),男,教授,博导,主要从事岩土工程研究。E-mail: nnwwkk@126.com
更新日期/Last Update: 2019-11-15