| 颗粒体材料在压缩位移控制加载条件下的力学行为及界面参数对它的影响 |
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| 引用本文： | 王学滨,伍小林,潘一山.颗粒体材料在压缩位移控制加载条件下的力学行为及界面参数对它的影响[J].防灾减灾工程学报,2012,32(3):274-280. |
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| 作者姓名： | 王学滨 伍小林 潘一山 |
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| 作者单位： | 辽宁工程技术大学力学与工程学院,辽宁阜新,123000 |
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| 基金项目： | 国家自然科学基金，辽宁省教育厅2009年度高等学校科研项目，国家重点基础研究发展计划项目 |
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| 摘 要： | 采用连续介质快速拉格朗日分析程序(FLAC),模拟了颗粒体材料在压缩位移控制加载条件下的力学行为及破坏过程.颗粒及它们之间的界面被离散为尺寸相同的单元.颗粒被视为各向同性的弹性材料,而界面被视为弹性-应变软化-理想塑性材料.界面完全破坏之后,其内聚力为零而内摩擦角不为零,因而适于模拟颗粒之间的摩擦行为.在双轴压缩条件下...
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| 关 键 词： | 颗粒体材料 围压 力学行为 压应力线 界面 剪切应变增量 |
Study on Mechanical Behavior of Granular Materials in Compressive Displacement-controlled Loading Condition and Effects of Parameters of Interfaces |
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| WANG Xue-bin
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WU Xiao-lin
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PAN Yi-shan.Study on Mechanical Behavior of Granular Materials in Compressive Displacement-controlled Loading Condition and Effects of Parameters of Interfaces[J].Journal of Disaster Prevent and Mitigation Eng,2012,32(3):274-280. |
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| Authors: | WANG Xue-bin WU Xiao-lin PAN Yi-shan |
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| Affiliation: | (College of Mechanics and Engineering,Liaoning Technical University,Fuxin 123000,China) |
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| Abstract: | Fast Lagrangian Analysis of Continua(FLAC) is used to model the mechanical behavior and failure process of granular materials under the condition of the compressive displacement-controlled loading.Circular granulae and interfaces between them are divided into squared elements with the same size.Granular elements are seen as isotropic and elastic materials,while interface elements obey a strain-softening and ideal plastic relation beyond the occurrence of failure.After an interface element is completely failed,its cohesion is assigned to be zero and the internal frictional angle is not zero.These assumptions are applicable for simulation of pure friction behavior between granulae.Numerical simulations are conducted in biaxial plane strain compression.Numerical results show that the compressive stresses propagate in the direction of the displacement-controlled loading within the specimen in the form of the compressive stress lines passing through the contact points between granulae.Eventually,clear and ordered compressive stress lines are formed.In some interface elements,shear strain increments are high.It is easy to find the weakest parts of the specimen from the regions with higher shear strain increments.Besides,effects of confining pressure acting on the lateral sides of the specimen,initial cohesion and internal frictional angle of interface elements on the stress-timestep curve are studied. |
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| Keywords: | granular material confining pressure mechanical behavior compressive stress line interface shear strain increment |
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