The strain rate effects of Q3 original loess during deformation
Guo Peng1,2,3 Wang Jianhua1,2 Sun Junjie3,4 Wang Qian3,4 Zhong Xiumei3,4 Li Na4
1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China;
2. Institute of Geotechnical Engineering, Tianjin University, Tianjin 300072, China;
3. Key Laboratory of Loess Earthquake Engineering, China Earthquake Administration & Gansu Province, Lanzhou 730000, China;
4. Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou 730000, China
Abstract：In order to reveal the influence law of strain rate during deformation of loess. Taking Lanzhou Q3 loess as an object of study, the triaxial tests of strain rate effect of loess are carried out under different water content and confining pressure conditions, and the stress-strain curve, shear strength, and pore pressure are analysed. The results show that there is strain softening effect in stress-strain curve, and high strain rate promotes the strain softening, however, high water content and high confining pressure restrain strain softening. The shear rate has a significant effect on the shear strength, and with the increase of the strain rate, the shear strength increases first and then decreases, the change law of cohesion is same as that of shear strength, but the influence of strain rate on the internal friction angle is opposite to the shear strength. The strain rate has little effect on growth trend of pore pressure, however, the peak pore pressure is significantly affected by strain rate. But, the variation rule is different with different water content and confining pressure. In a few words, there is a significant strain rate effect in deformation process of Q3 original loess, which is great significance to engineering application in loess area and rich loess mechanics.
郭 鹏 王建华 孙军杰 王 谦 钟秀梅 李 娜. Q3原状黄土变形过程中的应变速率效应[J]. 土木工程学报, 2019, 52(S2): 42-50.
Guo Peng Wang Jianhua Sun Junjie Wang Qian Zhong Xiumei Li Na. The strain rate effects of Q3 original loess during deformation. 土木工程学报, 2019, 52(S2): 42-50.
