Open AccessExperimental Study on the Triaxial Stress-strain Curve of Undisturbed Loess in Xining by Freeze-thaw Cycles
Author(s) -
Shuanghao Li,
Yuanxun Li,
Xinya Gao,
Dongmei Shi
Publication year - 2019
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/304/5/052065
Subject(s) - loess , geotechnical engineering , overburden pressure , shear stress , stress path , strain (injury) , stress (linguistics) , triaxial shear test , geology , softening , materials science , shear (geology) , composite material , geomorphology , medicine , linguistics , philosophy
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.