| Q3黄土侧向卸荷时的细观结构演化及强度特性 |
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| 引用本文： | 李加贵,陈正汉,黄雪峰,张力邈,姚志华.Q3黄土侧向卸荷时的细观结构演化及强度特性[J].岩土力学,2010,31(4):1084-1091. |
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| 作者姓名： | 李加贵 陈正汉 黄雪峰 张力邈 姚志华 |
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| 作者单位： | 解放军后勤工程学院,重庆,401311 |
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| 摘 要： | 利用应力控制式CT-三轴仪，在控制吸力的条件下研究了原状Q3黄土的细观结构演化和强度特性。结果表明：侧向卸载时，非饱和Q3黄土的应力-应变关系呈硬化型，可用双曲线描述；利用CT数据与试验中所施加偏应力之间的关系可确定试样的屈服应力，屈服应力随着吸力和固结净围压的增大而增大；侧向卸荷剪切试验结果得到的强度参数低于常规三轴压缩剪切试验的结果；利用定义的非饱和Q3黄土的结构参数，建立了侧向卸载过程的细观结构演化方程。
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| 关 键 词： | 非饱和黄土 CT-三轴试验 侧向卸载 结构性 |
| 收稿时间： | 2009-08-12 |
CT-triaxial shear tests on the meso-structure evolution and strength of unsaturated loess Q3 during unloading confining pressure |
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| LI Jia-gui,CHEN Zheng-han,HUANG Xue-feng,ZHANG Li-miao,YAO Zhi-hua.CT-triaxial shear tests on the meso-structure evolution and strength of unsaturated loess Q3 during unloading confining pressure[J].Rock and Soil Mechanics,2010,31(4):1084-1091. |
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| Authors: | LI Jia-gui CHEN Zheng-han HUANG Xue-feng ZHANG Li-miao YAO Zhi-hua |
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| Institution: | Logistical Engineering University of PLA, Chongqing 401311, China |
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| Abstract: | By the computerized tomography (CT), a series of unloading confining pressure tests were done on the condition of suction control to test the inside structural evolution of unsaturated loess Q3. The tests have proved that the relation between stress and strain of unsaturated loess Q3 becomes hardening as hyperbola, that is, the breakage of the specimen is plastic; the yielding stress of the specimen can be educed easily from the CT data and enforced deviator stress during the tests to see clearly the accretion of yielding stress with the increase of suction and confining pressure；compared with the test result of immovable confining pressure and accreting deviator stress, the strength parameter of unsaturated loess Q3 with unloading confining pressure CT-triaxial shear tests is lower on account of the different stress path. The equation of the unsaturated loess Q3 structural evolution has been set up by the definition of structure parameter. |
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| Keywords: | unsaturated loess CT-triaxial test unloading confining pressure structure |
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