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Study On Soil Water Characteristics Of Black Soil, Northeast China

Submitted2020-06-28
Last Update2020-06-28
TitleStudy On Soil Water Characteristics Of Black Soil, Northeast China
Author(s)Author #1
Author title:
Name: Haiqiang Jiang
Org: Doctor, South China Institution of Geotechnical Engineering, School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641, China
Country:
Email: hqiangjiang@126.com

Author #2
Author title:
Name: Fujun Niu
Org: Professor, South China Institution of Geotechnical Engineering, School of Civil Engineering and Transportation, South China University of Technology Guangzhou 510641, China
Country:
Email: niufj@scut.edu.cn

Author #3
Author title:
Name: Heng Zhang
Org: Doctor, South China Institution of Geotechnical Engineering, School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641, China
Country:
Email: 596045638 @qq.com

Author #4
Author title:
Name: Enliang Wang
Org: Professor, School of Water Conservancy and Civil Engineering, Northeast Agricultural University, Harbin 150030, China.
Country:
Email: wel@neau.edu.cn

Author #5
Author title:
Name: Qinguo Ma
Org: Assistant Professor, South China Institution of Geotechnical Engineering, School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641, China.
Country:
Email: Maqg@scut.edu.cn

Other Author(s)Jiehui Xie Doctor, South China Institution of Geotechnical Engineering, School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641, China 402265642@qq.com.
Contact AuthorAuthor #2
Alt Email: niufj@scut.edu.cn
Telephone:
KeywordsBlack soil, Soil water characteristic curve, Fractal dimension, Permeability coefficient, Dry density, Matric suction
AbstractBlack soil has strong swell-shrink characteristics due to the change of water content. Permeability and fractal behavior can be reflected by soil water characteristic curve (SWCC). Although many relevant models can calculate the SWCC, the applicability of these models on black soil is unclear. In addition, the prediction of the SWCC is complicated, as the necessary parameters are difficult and time-consuming to measure. In this context, a series of experiments on the SWCC of black soil was conducted in the laboratory. Based on the results and analysis, conclusions were drawn as follows: The pore fractal dimension is strongly correlated with dry density; that is, the larger the dry density is, the greater the fractal dimension becomes. The permeability coefficient decreases with the increasing of the matric suction. The three commonly SWCC models (Fredlund (1994), Van Genuchten (1980) and Gardner (1958)) are appropriate for predicting the SWCC of black soil. Moreover, the optimized van Genuchten model can improve the accuracy of prediction by replacing the model parameters with the formula of dry density. Compared with the van Genuchten model, the absolute value of relative error decreased from 4.50% to 3.75% after optimization.
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