| 真三轴条件下Q_2黄土的破坏模式与强度特性研究 |
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| 引用本文： | 于清高,邵生俊,佘芳涛,张建辉.真三轴条件下Q_2黄土的破坏模式与强度特性研究[J].岩土力学,2010,31(1):66-70. |
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| 作者姓名： | 于清高 邵生俊 佘芳涛 张建辉 |
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| 作者单位： | 1. 西安理工大学,岩土工程研究所,西安,710048
2. 陕西省黄土力学与工程重点实验室,西安,710048 |
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| 基金项目： | 国家自然科学基金，陕西省黄土力学与工程重点实验室基金 |
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| 摘 要： | 基于西安理工大学自主研发的新型真三轴试验仪,对不同含水率Q2黄土在不同b值、不同固结围压条件下进行了真三轴试验研究,分析了真三轴试样破坏方式、中主应力对抗剪强度参数的影响以及π平面上的强度破坏面。结果表明,Q2黄土真三轴试样破坏方式主要有侧胀破坏、锥形破坏、梯形破坏、六边形破坏;不同b值应力路经条件下黏聚力与三轴压缩条件下黏聚力的比值在0.9～1.9之间,内摩擦角比值在0.7～1.5之间。土的结构性和土体破坏方式对π平面上的强度破坏面的形状影响较大,固结围压对π平面上的强度破坏面的大小影响较大;原状Q2黄土在π平面上的强度破坏面形状主要呈现梨形和轴对称六边形;随着结构性由强到弱,π平面上的强度破坏面形状由梨形向轴对称六边形变化。
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| 关 键 词： | 真三轴试验 Q2黄土 破坏方式 强度破坏面 中主应力 |
| 收稿时间： | 2009-09-27 |
Research on failure modes and strength characteristics of Q2 loess under true triaxial condition |
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| YU Qing-gao,SHAO Sheng-jun,SHE Fang-tao,ZHANG Jian-hui.Research on failure modes and strength characteristics of Q2 loess under true triaxial condition[J].Rock and Soil Mechanics,2010,31(1):66-70. |
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| Authors: | YU Qing-gao SHAO Sheng-jun SHE Fang-tao ZHANG Jian-hui |
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| Institution: | 1. Institute of Geotechnical Engineering, Xi’an University of Technology, Xi’an 710048, China; 2. Shaanxi Provincial Key Laboratory of Loess Mechanics and Engineering, Xi’an 710048, China |
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| Abstract: | Based on the true triaxial apparatus of Xi’an University of Technology, the failure modes, intermediate principal stress influence on shear strength parameters and strength surface characteristics on π plane of Q2 loess with different water contents was analyzed under the condition of different intermediate principal stress ratio b and different meaning normal stress. It was shown that the failure modes of Q2 loess cubic samples behaved four kinds of failure formation, including of lateral bulge failure, taper failure, trapezoid failure, irregular hexagon failure by true triaxial tests. The shear strength parameters ratio could be got by comparing the strength parameters measured by true triaxial tests with the results of triaxial tests. The coherence ratio changes between 0.9 and 1.9. The friction angle ratio varies between 0.7 and 1.5. The structure property and failure formation of Q2 loess influence the shape of failure criteria on π plane. The consolidation pressure influence the value of failure surface in π plane. The shapes of Q2 loess failure criteria on π plane under different water contents and different consolidation pressures include pear-shape and irregular hexagon. With the structure property of Q2 loess reducing, the shapes of failure surface on π plane changes from pear-shape into irregular hexagon. |
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| Keywords: | true triaxial tests Q_2 loess failure modes strength failure surface intermediate principal stress |
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