A Method for Predicting Air-entry Value of Deformable Soils Based on Van Genuchten Model

TAO Gao-liang; LUO Chen-chen; LI Li-hua; LI Yi; LI Zi-yue

doi:10.11988/ckyyb.20191335

PDF(1185 KB)

Journal of Changjiang River Scientific Research Institute ›› 2021, Vol. 38 ›› Issue (1) : 84-88. DOI: 10.11988/ckyyb.20191335

ROCK-SOIL ENGINEERING

A Method for Predicting Air-entry Value of Deformable Soils Based on Van Genuchten Model

TAO Gao-liang^1,2, LUO Chen-chen¹, LI Li-hua¹, LI Yi¹, LI Zi-yue¹

Author information +

History +

Abstract

Air-entry value, as an important parameter of soil-water characteristic curve (SWCC), needs to be predicted in researching the hydraulic and mechanic properties of unsaturated deformable soils. A simple prediction model for the air-entry value of deformable soils was built by combining the Van Genuchten (VG) model with the variation law of SWCC under compression deformation condition. To verify the rationality of the model, experimental SWCC of Hunan clay were measured using pressure plate instrument, which are exploited to further obtain the measured value of air-entry value with different initial void ratios. The measured and predicted values were well consistent, indicating that the proposed model is of good performance. Moreover, VG model is used to simplify and unify the existing models of unsaturated relative permeability coefficient, and the validity and simplicity of this approach is verified.

Key words

air-entry value / clay / soil-water characteristic curve / Van Genuchten model / permeability coefficient of unsaturated soils

Cite this article

EndNote

Ris (Procite)

Bibtex

Download Citations

TAO Gao-liang, LUO Chen-chen, LI Li-hua, LI Yi, LI Zi-yue. A Method for Predicting Air-entry Value of Deformable Soils Based on Van Genuchten Model[J]. Journal of Changjiang River Scientific Research Institute. 2021, 38(1): 84-88 https://doi.org/10.11988/ckyyb.20191335

References

[1] 林群仙,李少和.基于两种粉质粘土的土水特征曲线试验对比分析[J].科技通报,2018,34(8):182-184.
[2] 罗启迅,黄靖,陈群.竖向应力及干密度对砾石土土-水特征曲线的影响研究[J].岩土力学,2014(3):729-734.
[3] 刘奉银,张昭,周冬,等.密度和干湿循环对黄土土-水特征曲线的影响[J].岩土力学,2011,32(增刊2):132-136.
[4] 孔郁斐,宋二祥.由土体级配近似确定土-水特征曲线的一种方法[J].岩土力学,2015,36(9):2487-2493.
[5] 孙德安,高游.不同制样方法非饱和土的持水特性研究[J].岩土工程学报,2015,37(1):91-97.
[6] 李幻,谢冰,徐辉,等.进气值对毛细滞回内变量模型的影响[J].岩土力学,2012,33(9):2724-2728.
[7] FALLOW D J, ELRICK D E. Field Measurement of Air-entry and Water-entry Soil Water Pressure Heads[J]. Soil Science Society of America Journal, 1996, 60(4):1036-1039.
[8] TINJUM J M, BENSON C H, BLOTZ L R. Soil-water Characteristic Curves for Compacted Clays[J]. Journal of Geotechnical and Geoenvironmental Engineering,1997,123(11):1060-1069.
[9] VANAPALLI S K,SILLERS W S,FREDLUND M D. The Meaning and Relevance of Residual State to Unsaturated Soil[C]//Proceedings of the 51st Canadian Geotechnical Conference. Edmonton,AB,Canada. October 4-7,1998.
[10]ZHOU Jian, YU Jian-lin. Influences Affecting the Soil-Water Characteristic Curve[J]. Journal of Zhejiang University Science, 2005, 6A(8):797-804.
[11]XU Y, XIA X. Fractal Model for Virgin Compression of Pure Clays[J]. Mechanics Research Communications, 2006, 33(2): 206-216.
[12]NUTH M, LALOUI L. Advances in Modelling Hysteretic Water Retention Curve in Deformable Soils[J]. Computers and Geotechnics, 2008, 35(6): 835-844.
[13]ZHAI Q, RAHARDJO H. Determination of Soil-Water Characteristic Curve Variables[J]. Computers and Geotechnics, 2012, 42: 37-43.
[14]WIJAYA M, LEONG E C, RAHARDJO H. Effect of Shrinkage on Air-entry Value of Soils[J]. Soils and Foundations, 2015, 55(1):166-180.
[15]ZHOU An-nan, YANG Fan, CHENG Wen-chieh, et al. A Fractal Model to Interpret Porosity-dependent Hydraulic Properties for Unsaturated Soils[J]. Advances in Civil Engineering, 2019, doi: 10.1155/2019/3965803.
[16]陶高梁,孔令伟.不同初始孔隙比土体进气值及土-水特征曲线预测[J].岩土工程学报,2017, 40(增刊1):34-38.
[17]TAO Gao-liang, CHEN Yin. A Simple Fractal-based Model for Soil-Water Characteristic Curves Incorporating Effects of Initial Void Ratios[J]. Energies, 2018, 11(6): 1-20.
[18]VAN GENUCHTEN M T H. A Closed-form Equation for Predicting the Hydraulic Conductivity of Unsaturated Soils[J]. Soil Science Society of America Journal, 1980, 44(5):892-898.
[19]LU Ning, LIKOS W J.非饱和土力学[M].韦昌富,侯龙,简文星,译.北京:高等教育出版社,2012.
[20]陶高梁,张季如,庄心善,等.压缩变形影响下的土-水特征曲线及其简化表征方法[J].水利学报,2014,45(10): 1239-1245.
[21]陶高梁,孔令伟,肖衡林,等.土-水特征曲线的分形特性及其分析拟合[J].岩土力学,2014(9):2443-2447.
[22]TAO Gao-liang, WU Xiao-kang, XIAO Heng-lin, et al. A Unified Fractal Model for Permeability Coefficient of Unsaturated Soil[J]. Fractals, 2019, 27(1): 1940012.
[23]TAO Gao-liang, ZHU Xue-liang, CAI Jian-chao, et al. A Fractal Approach for Predicting Unsaturated Hydraulic Conductivity of Deformable Clay[J]. Geofluids, 2019, doi: 10.1155/2019/8013851.