Influences of soluble salt content on mechanical properties of Ili undisturbed loess

NIU Li-si; ZHANG Ai-jun; ZHAO Jia-min; WANG Yu-guo; ZHAO Qing-yu

doi:10.11779/CJGE202009015

Volume 42 Issue 9

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Chinese Journal of Geotechnical Engineering > 2020 > 42(9): 1705-1714. > DOI: 10.11779/CJGE202009015

NIU Li-si, ZHANG Ai-jun, ZHAO Jia-min, WANG Yu-guo, ZHAO Qing-yu. Influences of soluble salt content on mechanical properties of Ili undisturbed loess[J]. Chinese Journal of Geotechnical Engineering, 2020, 42(9): 1705-1714. DOI: 10.11779/CJGE202009015

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Influences of soluble salt content on mechanical properties of Ili undisturbed loess

1.
College of Water Resources and Architectural Engineering, Northwest A & F University, Yangling 712100, China
2.
Central China Real Estate Limited, Zhengzhou 450004, China

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Received Date: October 28, 2019
Available Online: December 07, 2022

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Abstract

Abstract

In order to reveal the loading collapse yield and moisture characteristics of the unsaturated Ili undisturbed loess, a series of net mean stress increase-decrease tests on control suction, suction increase-decrease tests on control net mean stress, consolidation shear tests on control net confining pressure and suction under different soluble salt contents are carried out by using the unsaturated soil triaxial apparatus. The effects of soluble salt content on the deformation, yield and moisture of the unsaturated Ili loess are studied. The results show that there is a critical value for salt content to improve the cementation between particles. There are the peak yield net mean stress and the peak yield shear stress between 14 and 20 g/kg of salt content, and the loading collapse yield curve and the shear yield curve are the maximum. The compressibility index and moisture change at the consolidation stage decrease with the increase of salt content. The influences of salt content on moisture are mainly in the transition region of soil water characteristic drying curve, but there are few effects on the suction increase yield curve. The unsaturated Ili loess can be yielded by being excessively salting and reducing suction.
- unsaturated soil,
- Ili loess,
- soluble salt,
- yield characteristic,
- moisture characteristic

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