Lime treatment can enhance the workability and hydro-mechanical properties of soil through different physical-chemical reactions. Nevertheless, the beneficiary effect of lime treatment can be altered when the soil was exposed to wetting-drying cycles, depending on the wetting fluid and soil state. In the present study, the changes in small strain shear modulus (G_max) and microstructure of a compacted lime-treated silt under wetting-drying cycles were studied. The untreated state of soil was also considered for comparison. Meanwhile, the effects of wetting fluid (deionized water and synthetic seawater) and maximum soil aggregate size (D_max = 0.4 mm for S0.4 and 5 mm for S5) were investigated. Results showed that G_max increased significantly for the lime-treated soil over curing, and increased slightly for the untreated soil. The untreated specimens were softened and damaged by wetting-drying cycles, while the lime-treated specimens exhibited good resistance with the pore size distributions almost kept reversible along the wetting-drying paths. The subsequent more intensive drying resulted in a significant fabric alteration with occurrence of shrinkage-related fissures of the clay part. However, these fissures were almost healed with rewetting. Thereby, the G_max of lime-treated soil showed a constant decreasing trend with wetting and an increasing trend with drying. Moreover, G_max decreased slightly with wetting-drying cycles for the lime-treated specimens wetted by deionized water, suggesting that the wetting-drying indeed softened the soil. However, G_max increased for the lime-treated specimens wetted by synthetic seawater, due to the more production of cementitious compounds promoted by salts. The lime-treated specimens S0.4 wetted by synthetic seawater had higher G_max than those wetted by deionized water, while the wetting fluid had insignificant effect on the G_max of specimens S5 due to the limited promotion of pozzolanic reaction and negligible soil aggregation induced by salts.

石灰处理可以通过不同的物理化学反应提高土壤的可加工性和水力学性能。然而，当土壤暴露于干湿循环时，石灰处理的有益效果可能会改变，这取决于润湿液和土壤状态。在本研究中，研究了在干湿循环下压实的石灰处理粉土的小应变剪切模量 ( G _max ) 和微观结构的变化。土壤的未处理状态也被考虑用于比较。同时，研究了润湿液（去离子水和合成海水）和最大土壤团聚体尺寸（ S0.4 的D _max = 0.4 mm 和 S5 的 5 mm）的影响。结果表明，摹_最大石灰处理过的土壤在固化过程中显着增加，而在未经处理的土壤中略有增加。未经处理的试样被干湿循环软化和损坏，而石灰处理的试样表现出良好的抵抗力，孔径分布沿干湿路径几乎保持可逆。随后更密集的干燥导致显着的织物改变，粘土部分出现与收缩相关的裂缝。然而，这些裂缝几乎通过再润湿而愈合。因此，石灰处理土壤的G _max随润湿呈恒定下降趋势，随干燥呈上升趋势。此外，摹_最大对于用去离子水润湿的石灰处理过的样品，随着干湿循环的进行，土壤湿度略有下降，这表明干湿确实软化了土壤。然而，对于被合成海水润湿的石灰处理样品，G _max增加，因为盐促进了更多的胶结化合物的产生。用合成海水润湿的石灰处理试样 S0.4 的G _max高于用去离子水润湿的试样，而润湿液对试样 S5的G _max影响不显着，因为对火山灰反应的促进作用有限且诱导的土壤团聚可忽略不计通过盐。