The impacts of freeze–thaw cycles on saturated hydraulic conductivity and microstructure of saline–alkali soils

Abstract Study on the microscopic structure of saline–alkali soil can reveal the change of its permeability more deeply. In this paper, the relationship between permeability and microstructure of saline–alkali soil with different dry densities and water content in the floodplain of southwestern Shan...

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Autores principales:	Wenshuo Xu, Kesheng Li, Longxiao Chen, Weihang Kong, Chuanxiao Liu
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/66b3f5fed45e40899134bb267b5bd1cd
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spelling	oai:doaj.org-article:66b3f5fed45e40899134bb267b5bd1cd2021-12-02T18:48:02ZThe impacts of freeze–thaw cycles on saturated hydraulic conductivity and microstructure of saline–alkali soils10.1038/s41598-021-98208-02045-2322https://doaj.org/article/66b3f5fed45e40899134bb267b5bd1cd2021-09-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-98208-0https://doaj.org/toc/2045-2322Abstract Study on the microscopic structure of saline–alkali soil can reveal the change of its permeability more deeply. In this paper, the relationship between permeability and microstructure of saline–alkali soil with different dry densities and water content in the floodplain of southwestern Shandong Province was studied through freeze–thaw cycles. A comprehensive analysis of soil samples was conducted using particle-size distribution, X-ray diffraction, freeze–thaw cycles test, saturated hydraulic conductivity test and mercury intrusion porosimetry. The poor microstructure of soil is the main factor that leads to the category of micro-permeable soil. The porosity of the local soil was only 6.19–11.51%, and ultra-micropores (< 0.05 μm) and micropores (0.05–2 μm) dominated the pore size distribution. Soil saturated water conductivity was closely related to its microscopic pore size distribution. As the F–T cycles progressed, soil permeability became stronger, with the reason the pore size distribution curve began to shift to the small pores (2–10 μm) and mesopores (10–20 μm), and this effect was the most severe when the freeze–thaw cycle was 15 times. High water content could promote the effects of freeze–thaw cycles on soil permeability and pore size distribution, while the increase of dry density could inhibit these effects. The results of this study provide a theoretical basis for the remediation of saline–alkali soil in the flooded area of Southwest Shandong.Wenshuo XuKesheng LiLongxiao ChenWeihang KongChuanxiao LiuNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-15 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Wenshuo Xu Kesheng Li Longxiao Chen Weihang Kong Chuanxiao Liu The impacts of freeze–thaw cycles on saturated hydraulic conductivity and microstructure of saline–alkali soils
description	Abstract Study on the microscopic structure of saline–alkali soil can reveal the change of its permeability more deeply. In this paper, the relationship between permeability and microstructure of saline–alkali soil with different dry densities and water content in the floodplain of southwestern Shandong Province was studied through freeze–thaw cycles. A comprehensive analysis of soil samples was conducted using particle-size distribution, X-ray diffraction, freeze–thaw cycles test, saturated hydraulic conductivity test and mercury intrusion porosimetry. The poor microstructure of soil is the main factor that leads to the category of micro-permeable soil. The porosity of the local soil was only 6.19–11.51%, and ultra-micropores (< 0.05 μm) and micropores (0.05–2 μm) dominated the pore size distribution. Soil saturated water conductivity was closely related to its microscopic pore size distribution. As the F–T cycles progressed, soil permeability became stronger, with the reason the pore size distribution curve began to shift to the small pores (2–10 μm) and mesopores (10–20 μm), and this effect was the most severe when the freeze–thaw cycle was 15 times. High water content could promote the effects of freeze–thaw cycles on soil permeability and pore size distribution, while the increase of dry density could inhibit these effects. The results of this study provide a theoretical basis for the remediation of saline–alkali soil in the flooded area of Southwest Shandong.
format	article
author	Wenshuo Xu Kesheng Li Longxiao Chen Weihang Kong Chuanxiao Liu
author_facet	Wenshuo Xu Kesheng Li Longxiao Chen Weihang Kong Chuanxiao Liu
author_sort	Wenshuo Xu
title	The impacts of freeze–thaw cycles on saturated hydraulic conductivity and microstructure of saline–alkali soils
title_short	The impacts of freeze–thaw cycles on saturated hydraulic conductivity and microstructure of saline–alkali soils
title_full	The impacts of freeze–thaw cycles on saturated hydraulic conductivity and microstructure of saline–alkali soils
title_fullStr	The impacts of freeze–thaw cycles on saturated hydraulic conductivity and microstructure of saline–alkali soils
title_full_unstemmed	The impacts of freeze–thaw cycles on saturated hydraulic conductivity and microstructure of saline–alkali soils
title_sort	impacts of freeze–thaw cycles on saturated hydraulic conductivity and microstructure of saline–alkali soils
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/66b3f5fed45e40899134bb267b5bd1cd
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The impacts of freeze–thaw cycles on saturated hydraulic conductivity and microstructure of saline–alkali soils

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