Strength of Recompacted Loess Affected by Coupling between Acid–Base Pollution and Freeze–Thaw Cycles
Publication: Journal of Cold Regions Engineering
Volume 34, Issue 4
Abstract
To study how the coupling between acid–base pollution and freeze–thaw cycles (FTCs) affects the shear-strength properties of recompacted loess, soil specimens are subjected to direct shear tests after FTCs. The experimental results indicate that of the cohesion and internal friction angle of polluted soil, the former is much more likely to be affected by FTCs. The cohesion deteriorates significantly with more FTCs, and this is the main reason for the change in soil strength, i.e., the acid–base pollution acts to increase the soil strength, but the FTCs act to reduce it. The strength indexes of soil specimens with different concentrations of chemical solution after FTCs are also different. The order of the coupling effect on the soil strength is secondary pollution > primary pollution > no pollution. The composition of the soil specimens differs with the order in which the chemical solutions are added, thereby leading to differences in the apparent and strength characteristics of the soil after FTCs. It is concluded that consideration must be given to the impact of the change in soil strength properties after secondary pollution in seasonal frozen areas.
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Acknowledgments
This research was supported by the National Natural Science Foundation of China (Grant Nos. 51608436 and 51778528) and the research project of Shaanxi Province Education Department (Grant No. 15JK1406).
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Journal of Cold Regions Engineering
Volume 34 • Issue 4 • December 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Nov 21, 2019
Accepted: Jul 6, 2020
Published online: Aug 31, 2020
Published in print: Dec 1, 2020
Discussion open until: Jan 31, 2021
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