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Environmental Earth Sciences

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01.04.2020 | Original Article

Analysis of the pore structure characteristics of freeze-thawed saline soil with different salinities based on mercury intrusion porosimetry

verfasst von: Jiaqi Wang, Qing Wang, Yuanyuan Kong, Yan Han, Shukai Cheng

Erschienen in: Environmental Earth Sciences | Ausgabe 7/2020

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Abstract

The pore structure characteristics of soil are closely related to soil engineering properties. For saline soil distributed in seasonally frozen areas, existing studies have focused on the influence of freeze–thaw cycles on pore structure, while the influence of soluble salt in the soil is not well understood. This study aims to explore the influence of salt content and salt type on the pore structure of freeze-thawed soil. Soil samples with different salt contents (0–2%) and types (bicarbonate salt and sulfate salt) were subjected to 10 freeze–thaw tests, and their pore size distributions (PSDs) were obtained by mercury intrusion porosimetry tests. In addition, the PSDs were quantitatively analyzed by fractal theory. For both salts, the PSDs of the tested soil samples were bimodal after the freeze–thaw cycles, and the porosity of saline soil samples increased with increasing salt content overall. However, the contents of various types of pores in soil samples with two salt types were quite different. The variation in bicarbonate salt content mainly affected the mesopore and macropore contents in the soil samples, and their change trends were opposite to each other. For soil samples with sulfate salt, the porosity and macropore content increased significantly when the salt content exceeded 1%. In addition, the pore structures in saline soil presented fractal characteristics after the freeze–thaw cycles, and the fractal dimension was positively correlated with macropore content. This study may provide references for understanding the engineering properties of saline soil in seasonally frozen areas at the microscale.

Vorheriger Artikel Hydrochemical characteristics and a health risk assessment of the use of river water and groundwater as drinking sources in a rural area in Jiangjin District, China

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Titel: Analysis of the pore structure characteristics of freeze-thawed saline soil with different salinities based on mercury intrusion porosimetry
verfasst von: Jiaqi Wang
Qing Wang
Yuanyuan Kong
Yan Han
Shukai Cheng
Publikationsdatum: 01.04.2020
Verlag: Springer Berlin Heidelberg
Erschienen in: Environmental Earth Sciences / Ausgabe 7/2020
Print ISSN: 1866-6280
Elektronische ISSN: 1866-6299
DOI: https://doi.org/10.1007/s12665-020-08903-w

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