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| Cyclic Shearing Deformation Behavior of Saturated Clays | |
| 作者姓名： | QI Jianfeng LUAN Maotian FENG Xiuli MA Tailei NIE Ying |
| 作者单位： | QI Jianfeng1)，2)，LUAN Maotian1)，2)，FENG Xiuli3)，MA Tailei1)，2)，and NIE Ying1)，2) 1) The State Key Laboratory of Coastal and Offshore Engineering，Dalian University of Technology，Dalian 116024，P. R. China 2) Institute of Geotechnical Engineering，School of Civil and Hydraulic Engineering，Dalian University of Technology，Dalian 116024，P. R. China 3) College of Marine Geosciences，Ocean University of China，Qingdao 266003，P. R. China |
| 摘 要： | The apparatus for static and dynamic universal triaxial and torsional shear soil testing is employed to perform stress-controlled cyclic single-direction torsional shear tests and two-direction coupled shear tests under unconsolidated-undrained conditions. Through a series of tests on saturated clay, the effects of initial shear stress and stress reversal on the clay’s strain-stress behavior are examined, and the behavior of pore water pressure is studied. The experimental results indicate that the patterns of stress-strain relations are distinctly influenced by the initial shear stress in the cyclic single-direction shear tests. When the initial shear stress is large and no stress reversal occurs, the predominant deformation behavior is characterized by an accumulative effect. When the initial shear stress is zero and symmetrical cyclic stress occurs, the predominant deformation behavior is characterized by a cyclic effect. The pore water pressure fluctuates around the confining pressure with the increase of cycle number. It seems that the fluctuating amplitude increases with the increase of the cyclic stress. But a buildup of pore water pressure does not occur. The de- formations of clay samples under the complex initial and the cyclic coupled stress conditions include the normal deviatoric deforma- tion and horizontal shear deformation, the average deformation and cyclic deformation. A general strain failure criterion taking into account these deformations is recommended and is proved more stable and suitable compared to the strain failure criteria currently used. |
| 关 键 词： | 循环应力 饱和黏土 海洋科学 实验研究 |
| 收稿时间： | 2 September 2006 |
| 修稿时间： | 2006-09-02 |
Cyclic shearing deformation behavior of saturated clays |
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| QI Jianfeng LUAN Maotian FENG Xiuli MA Tailei NIE Ying.Cyclic Shearing Deformation Behavior of Saturated Clays[J].Journal of Ocean University of China,2007,6(4):413-420. | |
| Authors: | Qi Jianfeng Luan Maotian Feng Xiuli Ma Tailei Nie Ying |
| Institution: | 1. The State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, P. R. China;Institute of Geotechnical Engineering, School of Civil and Hydraulic Engineering, Dalian University of Technology, Dalian 116024, P. R. China 2. College of Marine Geosciences, Ocean University of China, Qingdao 266003, P. R. China 3. The State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, P. R. China |
| Abstract: | The apparatus for static and dynamic universal triaxial and torsional shear soil testing is employed to perform stress-controlled cyclic single-direction torsional shear tests and two-direction coupled shear tests under unconsolidated-undrained conditions. Through a series of tests on saturated clay, the effects of initial shear stress and stress reversal on the clay’s strain-stress behavior are examined, and the behavior of pore water pressure is studied. The experimental results indicate that the patterns of stress-strain relations are distinctly influenced by the initial shear stress in the cyclic single-direction shear tests. When the initial shear stress is large and no stress reversal occurs, the predominant deformation behavior is characterized by an accumulative effect. When the initial shear stress is zero and symmetrical cyclic stress occurs, the predominant deformation behavior is characterized by a cyclic effect. The pore water pressure fluctuates around the confining pressure with the increase of cycle number. It seems that the fluctuating amplitude increases with the increase of the cyclic stress. But a buildup of pore water pressure does not occur. The deformations of clay samples under the complex initial and the cyclic coupled stress conditions include the normal deviatoric deformation and horizontal shear deformation, the average deformation and cyclic deformation. A general strain failure criterion taking into account these deformations is recommended and is proved more stable and suitable compared to the strain failure criteria currently used. |
| Keywords: | cyclic stress complex stress state saturated clay stress-strain relations failure criterion |
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