Test on Triaxial Shear Properties of Saturated Undisturbed Q2 Loess in Deep-Buried Tunnel

详细信息   

• 责任者：Jiang Yao (Key Laboratory of Mechanics on Western Disaster and Environment ; Ministry of Education ; School of Civil Engineering and Mechanics ; Lanzhou University ; Lanzhou 730000 ; China) ; Chen Wenwu
• 刊名：Journal of Lanzhou University (Natural Sciences)
• 出版年：2012
• 卷期：48(3)
• 关键词：黄土类土 ; loessial soil ; 三轴试验 ; triaxial tests ; 甘肃 ; Gansu Province
• 页码：p.23-27, 33
• 图表：2 illus., 2 tables, 15 refs.
• 分类号：1702
• issnNo：ISSN0455-2059
• isbnNo：CN62-1075/N

摘要

Based on scientific interpretation and analysis of test data, the stress-strain curve of saturated undisturbed Q2 loess under a conventional consolidated undrained triaxial shear test showed a strain softening, while the failure model displayed brittle failure. The softening behavior of the stress-strain curve had a trend of attenuation with the increase of confining pressure and the strain before the peak was approximately elastic. During the process of shear test, the pore-water pressure was positive. Under lower confining pressure, the pore- water pressure curve had peak value and the shape of pore-water pressure curve looked like softening. While the pore-water pressure under a larger confining pressure increased with an increasing axial strain. It was also shown that the strength of undisturbed Q2 loess would increase with the confining pressure and the breaking stress of loess would augment with it. The curve of the effective stress path had a similar linear shape.