Abstract
Freeze-thaw is an important climatic phenomenon in middle and high latitudes and high altitudes. The effect of freeze-thaw on soil structure will be different from that without freeze-thaw. In order to study the structural stability of the compound soil of soft rock and sand in the Mu Us Sandy Land under the influence of seasonal freeze-thaw environment, this study adopted the method of combining indoor freeze-thaw simulation and field investigation to analyze the influence of freeze-thaw cycle on the structural stability of the compound soil. The results showed that after 10 cycles of freezing and thawing, the content of large aggregate structure (>1 mm) in 1:0, 1:1, 1:2, and 1:5 compound soils all decreased, and the decrease rate of 1:1 compound soil was the smallest. The content of small aggregate structure (<1 mm) increased, and the composition of each particle size was mostly concentrated between 0.5 and 0.25 mm. Therefore, the low freeze-thaw cycle can break large soft rock rocks, promote the full mixing of soft rock and sand, and improve the structure of the surface compound soil, instead of being dominant.
Published Version
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