| 原状黄土CT试验中应力-应变关系的研究 |
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| 引用本文： | 王朝阳,许强,倪万魁.原状黄土CT试验中应力-应变关系的研究[J].岩土力学,2010,31(2):387-391. |
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| 作者姓名： | 王朝阳 许强 倪万魁 |
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| 作者单位： | 1. 成都理工大学,地质灾害防治与地质环境保护国家重点实验室,成都,610059
2. 长安大学,地质工程与测绘学院,西安,710054 |
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| 摘 要： | 采用三轴CT实时试验对原状黄土在三轴剪切试验过程中的应力-应变进行了研究。分析了Q2和Q3黄土的应力-应变曲线,提出了原状黄土的初始损伤应力、应变门槛值的确定方法。基于试验结果,指出Q2黄土在低围压下较Q3黄土更易发生损伤,且其发生损伤的应变门槛值较Q3黄土低。在此基础上,提出了用CT数所定义的损伤变量公式,拟合得出损伤变量与轴向应变及偏应力的关系式。
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| 关 键 词： | 原状黄土 损伤 应力-应变关系 |
| 收稿时间： | 2008-09-05 |
Study of undisturbed loess stress-strain relation during CT test |
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| WANG Zhao-yang,XU Qiang,NI Wan-kui.Study of undisturbed loess stress-strain relation during CT test[J].Rock and Soil Mechanics,2010,31(2):387-391. |
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| Authors: | WANG Zhao-yang XU Qiang NI Wan-kui |
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| Institution: | 1. State key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China; 2. College of Geology Engineering and Geomatics, Chang’an University, Xi’an 710054, China |
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| Abstract: | The stress-strain relation of undisturbed loess during triaxial shear test is studied by using real-time computerized tomography(CT) scanning. The curves of loesses Q2 and Q3 are analyzed; and the method how to determine the initial damage stress and strain threshold value is proposed. Based on analyzing the test results, it is pointed out that the loess Q2 will be damaged easily under low confining pressure; and its damage strain threshold value is lower than that of loess Q3. At last, damage variable formula defined by CT values and the relationship of the damage variable, axial strain and deviatoric stress is given. |
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| Keywords: | undisturbed loess damage stress-strain relation |
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