Abstract
This research investigates the permeability and compressibility performance of aeolian-Na/Ca-bentonite mixtures (ANB/ACB) with varying bentonite contents, subjected to different freeze–thaw cycles, in which the particle size analysis, permeability tests, and compression tests are employed. The results indicate that: (1) with increasing bentonite content, ANB/ACB exhibits a gradual rise in uniformity coefficient, curvature coefficient, clay content, and compression index (Cc), accompanied by a decrease in permeability coefficient. Moreover, ACB’s compression index gradually surpasses that of ANB. Under equivalent bentonite content, ACB demonstrates higher values for non-uniformity coefficient, curvature coefficient, and clay content than ANB; (2) experiencing freeze–thaw cycles, ANB exhibits an increasing permeability coefficient, whereas ACB, particularly at a high bentonite content, experiences a decreasing permeability coefficient with additional freeze–thaw cycles. Simultaneously, freeze–thaw effects degrade the compression indices of both ACB and ANB; and (3) increasing the normal stress leads to a rapid reduction in compression coefficients for ANB and ACB, with the rate of decrease gradually slowing down. Under constant normal stress, the compression coefficient ratio (ANB/ACB) decreases with rising bentonite content and increases with the number of freeze–thaw cycles. Additionally, electron microscope scans revealed that the freeze–thaw cycle effect influences the permeability and compressibility of the soil by altering the soil sample’s pore structure and particle size.
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Funding
The authors thank for the financial support funded by National Natural Science Foundation of China (NSFC) (Grant Number U22A20596) and Science and Technology Major Project of Tibetan Autonomous Region of China (XZ202201ZD0003G).
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Chen, C., Peng, W., Li, J. et al. Effects of Freeze–Thaw Cycle on Permeability and Compression Properties of Aeolian Soil–Bentonite Mixture. Iran J Sci Technol Trans Civ Eng (2024). https://doi.org/10.1007/s40996-024-01431-8
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DOI: https://doi.org/10.1007/s40996-024-01431-8