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：1-6
DOI：10.1088/1755-1315/304/5/052065
出版社：IOP Publishing
摘要：The undisturbed loess in the high-altitude and high-altitude Xining area was studied. The triaxial shear tests of different freeze-thaw cycles and different confining pressures were carried out to investigate the stress-strain changes of undisturbed loess before and after freezing and thawing. The test results show that: (1) different stresses are applied to the samples to show different stress-strain curves. Low confining pressure is strain softening; high confining pressure is strain hard. (2) When the number of freeze-thaw cycles is 0, 1 time, the initial stress phase at different confining pressures is interlaced; when the freeze-thaw cycle is 3 times, in the later stage of strain, the growth rate is 30%-50%. The freeze-thaw effect has a great influence on the internal strength of the soil structure.
