Determining soil water characteristic curve of lime treated loess using multiscale structure fractal characteristic

Determining soil water characteristic curve of lime treated loess using multiscale structure fractal characteristic

Abstract Soil–Water characteristic Curve (SWCC) is meant to describe the mechanical behavior of unsaturated soil. The present paper focuses on the internal multi-scale microstructure of Xining untreated loess and lime-treated loess with the use of scanning electron microscopy (SEM) and image process...

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Autores principales: Xiaojun Li, Chenzhi Hu, Fengyan Li, Hongling Gao
Formato: article
Lenguaje:EN
Publicado: Nature Portfolio 2020
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Acceso en línea:https://doaj.org/article/20aabc358e1d4d0a9bc53ef5d4f2f4a5
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spelling oai:doaj.org-article:20aabc358e1d4d0a9bc53ef5d4f2f4a52021-12-02T16:18:03ZDetermining soil water characteristic curve of lime treated loess using multiscale structure fractal characteristic10.1038/s41598-020-78489-72045-2322https://doaj.org/article/20aabc358e1d4d0a9bc53ef5d4f2f4a52020-12-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-78489-7https://doaj.org/toc/2045-2322Abstract Soil–Water characteristic Curve (SWCC) is meant to describe the mechanical behavior of unsaturated soil. The present paper focuses on the internal multi-scale microstructure of Xining untreated loess and lime-treated loess with the use of scanning electron microscopy (SEM) and image processing technique. A new SWCC model was presented based on the fractal dimension of pore size distribution. The SWCC of untreated loess was calculated from fractal dimension and fitted well with curve tested from Fredlund SWCC device. The SWCC of lime-treated loess was then calculated. Two curves of Xining untreated loess and lime-treated loess have been compared and reasons for the difference have also been discussed. The results indicate that the content of large pores in lime-treated loess decreased and the content of micro-pore increased. The bracket pores were changed into cement pores. The pore fractal dimension D of Xining untreated loess is 1.39 and the pore fractal dimension D of Xining lime-treated loess is 1.53. Air-entry value of untreated loess is 12.16 kPa, while lime-treated Loess—35.15 kPa. In transition region, matric suction of lime-treated loess was in the range of 35.15 kPa ~ 4000 kPa, while matric suction of untreated loess—12.16 kPa ~ 2600 kPa. The range of the transition region in lime-treated loess is larger than that in the loess, while in the range of saturation region, the reverse applies. Under the condition of the same matrix suction, the saturation of lime-treated loess is greater than that of untreated loess. In the residual region, the difference of SWCC of soil samples is small.Xiaojun LiChenzhi HuFengyan LiHongling GaoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 10, Iss 1, Pp 1-11 (2020)
institution DOAJ
collection DOAJ
language EN
topic Medicine
R
Science
Q
spellingShingle Medicine
R
Science
Q
Xiaojun Li
Chenzhi Hu
Fengyan Li
Hongling Gao
Determining soil water characteristic curve of lime treated loess using multiscale structure fractal characteristic
description Abstract Soil–Water characteristic Curve (SWCC) is meant to describe the mechanical behavior of unsaturated soil. The present paper focuses on the internal multi-scale microstructure of Xining untreated loess and lime-treated loess with the use of scanning electron microscopy (SEM) and image processing technique. A new SWCC model was presented based on the fractal dimension of pore size distribution. The SWCC of untreated loess was calculated from fractal dimension and fitted well with curve tested from Fredlund SWCC device. The SWCC of lime-treated loess was then calculated. Two curves of Xining untreated loess and lime-treated loess have been compared and reasons for the difference have also been discussed. The results indicate that the content of large pores in lime-treated loess decreased and the content of micro-pore increased. The bracket pores were changed into cement pores. The pore fractal dimension D of Xining untreated loess is 1.39 and the pore fractal dimension D of Xining lime-treated loess is 1.53. Air-entry value of untreated loess is 12.16 kPa, while lime-treated Loess—35.15 kPa. In transition region, matric suction of lime-treated loess was in the range of 35.15 kPa ~ 4000 kPa, while matric suction of untreated loess—12.16 kPa ~ 2600 kPa. The range of the transition region in lime-treated loess is larger than that in the loess, while in the range of saturation region, the reverse applies. Under the condition of the same matrix suction, the saturation of lime-treated loess is greater than that of untreated loess. In the residual region, the difference of SWCC of soil samples is small.
format article
author Xiaojun Li
Chenzhi Hu
Fengyan Li
Hongling Gao
author_facet Xiaojun Li
Chenzhi Hu
Fengyan Li
Hongling Gao
author_sort Xiaojun Li
title Determining soil water characteristic curve of lime treated loess using multiscale structure fractal characteristic
title_short Determining soil water characteristic curve of lime treated loess using multiscale structure fractal characteristic
title_full Determining soil water characteristic curve of lime treated loess using multiscale structure fractal characteristic
title_fullStr Determining soil water characteristic curve of lime treated loess using multiscale structure fractal characteristic
title_full_unstemmed Determining soil water characteristic curve of lime treated loess using multiscale structure fractal characteristic
title_sort determining soil water characteristic curve of lime treated loess using multiscale structure fractal characteristic
publisher Nature Portfolio
publishDate 2020
url https://doaj.org/article/20aabc358e1d4d0a9bc53ef5d4f2f4a5
work_keys_str_mv AT xiaojunli determiningsoilwatercharacteristiccurveoflimetreatedloessusingmultiscalestructurefractalcharacteristic
AT chenzhihu determiningsoilwatercharacteristiccurveoflimetreatedloessusingmultiscalestructurefractalcharacteristic
AT fengyanli determiningsoilwatercharacteristiccurveoflimetreatedloessusingmultiscalestructurefractalcharacteristic
AT honglinggao determiningsoilwatercharacteristiccurveoflimetreatedloessusingmultiscalestructurefractalcharacteristic
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