| 粗粒土三轴试验的细观模拟 |
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| 引用本文： | 耿丽,黄志强,苗雨.粗粒土三轴试验的细观模拟[J].华中科技大学学报(城市科学版),2011,28(4). |
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| 作者姓名： | 耿丽 黄志强 苗雨 |
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| 作者单位： | 1. 华中科技大学土木工程与力学学院,湖北武汉,430074
2. 中国地质大学(武汉)工程学院,湖北武汉,430074 |
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| 基金项目： | 国家自然科学基金(50808090) |
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| 摘 要： | 对排土场粗粒土进行室内三轴固结排水试验,以此试验结果为基础,基于三维离散元颗粒流理论,从细观角度出发,以PFC3D为工具,通过自编程序并引入接触黏结模型,得到按级配生成的粗粒土三轴试验三维颗粒流模型.对比了不同围压下颗粒流模型与三轴试验的应力应变关系.分析了颗粒细观参数对粗粒土强度的影响.结果表明:按级配曲线得到的PFC数值模型的应力应变曲线的变化趋势与试验值一致,但强度值略低于试验值.粗粒土强度随颗粒间摩擦系数、接触处黏结强度的增大而提高；颗粒形状对材料的抗剪强度影响显著.研究意义在于从细观角度揭示影响粗粒土强度的因素,突破了常规三轴试验的局限性.
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| 关 键 词： | 粗粒土 三轴试验 细观模拟 颗粒形状 |
Meso-mechanics Simulation Triaxial Test of Coarse-grained Soil |
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| GENG Li
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HUANG Zhi-qiang
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MIAO Yu.Meso-mechanics Simulation Triaxial Test of Coarse-grained Soil[J].Journal of Huazhong University of Science and Technology,2011,28(4). |
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| Authors: | GENG Li HUANG Zhi-qiang MIAO Yu |
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| Affiliation: | GENG Li1,HUANG Zhi-qiang1,MIAO Yu1(1.School of Civil Engineering and Mechanics,Huazhong University of Science and Technology,Wuhan 430074,China,2.Faculty of Engineering,China University of Geosciences,China) |
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| Abstract: | Consolidated-drained triaxial test is conducted for coarse-grained soil,based on the values of this test and three dimension particle flow code theory,the numerical model of triaxial test for graded coarse-grained soil is obtained by programming PFC3D(particle flow code of three dimension)from the view of microscopic scale.Stress-strain relationship of particle flow model and triaxial test are compared under different confining pressure.The influence of micro-properties on coarse-grained soil strength is an... |
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| Keywords: | coarse-grained soil triaxial test meso-mechanics simulation particle shape |
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