| 饱和砂土液化过程中细观组构的模型试验研究 |
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| 引用本文： | 周健,杨永香,刘洋.饱和砂土液化过程中细观组构的模型试验研究[J].同济大学学报(自然科学版),2009,37(4). |
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| 作者姓名： | 周健 杨永香 刘洋 |
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| 作者单位： | 1. 同济大学,地下建筑与工程系,上海,200092;同济大学,岩土及地下工程教育部重点实验室,上海,200092
2. 北京科技大学,土木与环境工程学院,北京,100083 |
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| 摘 要： | 采用室内振动台模型试验对液化过程中饱和砂土颗粒的细观组构进行研究.分析了砂土颗粒在液化破坏过程中颗粒长轴方向、平均配位数、孔隙率的演化规律及其与宏观现象之间的联系.应用表征上述量的组构参数分析了砂土的诱发各向异性,指出在循环荷载的作用下,砂土颗粒不断重新排列定向以适应新的应力状态,导致累积配位数的丧失、孔隙率增大,继而导致液化的发生.研究成果对于揭示砂土变形(液化)的细观机理以及建立砂土的细观力学模型都具有重要意义.
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| 关 键 词： | 饱和砂土液化 细观组构 配位数 模型试验 |
Model Testing of Meso fabric of Saturated Sand Liquefaction |
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| ZHOU Jian,YANG Yongxiang and LIU Yang.Model Testing of Meso fabric of Saturated Sand Liquefaction[J].Journal of Tongji University(Natural Science),2009,37(4). |
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| Authors: | ZHOU Jian YANG Yongxiang and LIU Yang |
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| Institution: | Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China;Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education,Tongji University,Shanghai 200092,China;Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China;Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education,Tongji University,Shanghai 200092,China;Department of Civil Engineering,University of Science and Technology Beijing,Beijing 100083,China |
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| Abstract: | Based on the shaking table model testing,the meso fabric characteristics of saturated sand are studied including macro axis orientation for sand granules,average coordination numbers and porosity.Induced anisotropy of sand is analyzed by fabric features.The results show that under cyclic loading,sand granules continuously rearrange and redirect for the new stress state which results in decreasing cumulative coordination numbers and increasing porosity,and then liquefaction.The study is expected to contribute to disclosing the meso mechanism of sand liquefaction relating to the meso fabric and macro mechanical response of granular soils and developing meso mechanical models of granular media. |
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| Keywords: | liquefaction meso fabric coordination number model testing |
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