| 三轴压缩下南京下蜀土的宏、微观性状试验 |
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| 引用本文： | 韩爱民,肖军华,乔春元,丁长阳.三轴压缩下南京下蜀土的宏、微观性状试验[J].吉林大学学报(地球科学版),2013,43(6):1897. |
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| 作者姓名： | 韩爱民 肖军华 乔春元 丁长阳 |
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| 作者单位： | 南京工业大学岩土工程研究所，南京210009 |
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| 基金项目： | 国家自然科学基金;国家自然科学基金 |
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| 摘 要： | 为探讨南京下蜀土在三轴压缩下的宏观力学性质及微观演化机理，分别通过三轴试验仪和扫描电子显微镜（SEM）研究了下蜀土的宏观变形、强度特性及微结构变化规律。结果表明：下蜀土的结构强度与围压的比值基本上为常数，土体的结构强度与内部颗粒的排列、胶结性能,以及外部应力状态有关。三轴压缩下，随着应变增大，下蜀土中较大颗粒集聚体受剪破坏，而较小颗粒通过聚集增大，使得土体颗粒面积比例增大，但颗粒集团化程度降低，平面分布分散，颗粒排列逐渐朝无序发展，并在无序程度最高部位形成了剪切破坏带。
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| 关 键 词： | 三轴压缩 下蜀土 变形 强度 微结构 土 |
| 收稿时间： | 2012-11-11 |
Experiments on Micro and Macro Behaviors of Nanjing Xiashu Soil Uunder Triaxial Compression |
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| Han Aimin,Xiao Junhua,Qiao Chunyuan,Ding Changyang.Experiments on Micro and Macro Behaviors of Nanjing Xiashu Soil Uunder Triaxial Compression[J].Journal of Jilin Unviersity:Earth Science Edition,2013,43(6):1897. |
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| Authors: | Han Aimin Xiao Junhua Qiao Chunyuan Ding Changyang |
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| Institution: | Institute of Geotechnical Engineering，Nanjing University of Technology，Nanjing210009，China |
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| Abstract: | To investigate macroscopic mechanical properties and microstructure evolution mechanisms of Nanjing Xiashu soil under triaxial compression, triaxial apparatus and scanning electron microscope（SEM）were used respectively to perform a series of experiments. Results show that the ratio of structural strength of Xiashu soil to confining pressure is almost a constant, and the structural strength depends on internal particles arrangements of soil, bonding capacity between particles and outer stress states. As shear strain of soil increases under triaxial compression, greater particle aggregates are sheared breakage, and smaller ones enlarge by gathering together, resulting in increase of particle area ratio but reducing its collectivization degree and scattering its planar distributions. Consequently, the particles arrangements gradually tends to disorder, and finally shear failure zone forms in the most disordered part. |
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| Keywords: | triaxial compression Xiashu soils deformation structural strength microstructure soils |
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