Abstract
In order to gain a deeper understanding of the changes in pore characteristics of undisturbed loess under the influence of acid pollution and the underlying microscopic mechanisms, this study investigates the alterations in pore characteristics caused by acid pollution and their relationship with macroscopic strength. Strength tests, scanning electron microscopy (SEM), and nuclear magnetic resonance (NMR) tests were conducted on undisturbed loess under various acid pollution conditions to comprehend the evolution of these characteristics. The research findings indicate the presence of a critical acid pollution level in soil. Below this level, increasing acid pollution results in a more uniform distribution of pores, a decrease in the difference between the long and short axes, and a complex edge shape. The arrangement of pores also tends to be disordered. However, when the acid pollution exceeds the critical level, it leads to uneven distribution of pores and an increase in the difference between the long and short axes. The shape of the edges becomes more regular and the pore arrangement becomes more orderly. As the acid pollution intensifies, the total volume of pores between aggregates decreases, while the total volume of pores within aggregates increases. This study examines the impact of acid pollution on the characteristics of loess pores, providing valuable insights into the soil-water-acid properties and deformation management of loess in practical engineering applications. These findings are of practical significance for the construction and protection of loess engineering in loess areas.
Published Version
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