Effect of Soluble Saltand Freeze-thaw Cycle on Strength Deterioration and Water Stability of Lime-treated Ili Loess
LIANG Zhichao1,†, REN Wenyuan1,†, LI Shuangcun1, ZHANG Aijun1,2,*, WANG Yuguo3
1 College of Water Resources and Architectural Engineering, Northwest A & F University, Yangling 712100, Shaanxi, China
2 College of Civil engineering, Xijing University, Xi'an 710000, China
3 Institute for Interdisciplinary and Innovation Research, Xi'an University of Architecture and Technology, Xi'an 710000, China
Abstract: Freeze-thaw cycle and soluble salt are main reasons for the damage of soils of water conveyance channels in cold regions. To explore the influence mechanism and degree of freeze-thaw cycle and soluble salt content on strength, water stability and pore structure of lime-treated Ili loess, unconfined compressive strength test, disintegration test, permeability test and nuclear magnetic resonance test are employed here. The results show that the freeze-thaw cycle has obvious deterioration on the strength of lime-treated Ili loess. The deterioration of strength is serious in early freeze-thaw cycle stage, and the higher the content of soluble salt, the deterioration of strength due to freeze-thaw cycle. When the content of soluble salt is higher than 14 g/kg, the deterioration rate on the strength decreases. The disintegration of lime solidified Ili loess is accelerated with the increase of freeze-thaw cycles and soluble salt content, and the soluble salt content has a great effect on loess water stability. When the soluble salt content is higher than 8 g/kg, the disintegration rate increased significantly. The permeability increases with the increase of freeze-thaw cycle and soluble salt content, and the effect of freeze-thaw cycle is more significant than that of soluble salt content. When the content of soluble salt is 26 g/kg, the permeability coefficient decreases obviously due to the effect of osmotic suction. The modal size of loess pores increases with freeze-thaw cycle increasing, which mainly affects the medium pores and large pores. And the effect of freeze-thaw cycle on pore structure of loess is higher than that of soluble salt content. Considering freeze-thaw cycle and controlling soluble salt content is very important for strength and water stability of soil in cold region.
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2025, Vol. 39 
