期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2019
卷号：304
期号：5
页码：1-7
DOI：10.1088/1755-1315/304/5/052064
出版社：IOP Publishing
摘要：The collapsible loess in Xining area was tested by confined compression test to analyze collapsible and compression deformation of the loess. The researchers used electron microscopy to qualitatively analyze the microstructure of the loess samples before and after collapse. A comprehensive analysis of the relationship between the microstructure of the loess sample and the collapse deformation. The results show that: (1)with the increase of depth, the amount of collapse deformation and compression under the same pressure gradually become smaller, the soil is compacted, the strength is increased, and the compressibility and collapsibility are weakened; (2) due to the influence of loess stress history on its structure and collapsibility, with the increase of depth, the 6m loess exhibits less collapsible deformation and compressive deformation than the 3m loess; (3)with the increase of depth before and after immersion, the arrangement of pores tends to be stable, the particle distribution is gradually concentrated, the degree of agglomeration becomes higher, and the proportion of pore area gradually decreases. The collapsible deformation and compression deformation of loess before and after water immersion are consistent with the microstructure changes.
