Open AccessFreezing - thawing cycles characteristics of soft rock and sand compound soil in Mu Us sandy land
Author(s) -
Haiou Zhang,
Chenxi Yang,
Wang Jian
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/769/3/032073
Subject(s) - soil structure , aggregate (composite) , soil water , soil science , geotechnical engineering , environmental science , geology , mineralogy , materials science , composite material
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.