Experimental Study on the Triaxial Stress-strain Curve of Undisturbed Loess in Xining by Freeze-thaw Cycles. Issue 5 (September 2019)

• Record Type: Journal Article
• Authors: Li, Shuanghao; Li, Yuanxun; Gao, Xinya; Shi, Dongmei
• Is Part Of: IOP conference series. Volume 304:Issue 5(2019)
• Publication Date: 2019-09
• Subjects: Earth sciences -- Periodicals; Environmental sciences -- Congresses; Environmental sciences -- Periodicals; 550.5
• DOI: 10.1088/1755-1315/304/5/052065
• Languages: English
• ISSNs: 1755-1307

Abstract

Abstract: 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.