| 筑坝反滤料动模量和阻尼比试验的颗粒流模拟 |
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| 引用本文： | 刘汉龙,高德清,陈育民,李国英.筑坝反滤料动模量和阻尼比试验的颗粒流模拟[J].防灾减灾工程学报,2009,29(4):361-367. |
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| 作者姓名： | 刘汉龙 高德清 陈育民 李国英 |
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| 作者单位： | 1. 河海大学岩土力学与堤坝工程教育部重点试验室、河海大学岩土工程科学研究所,南京,210098
2. 南京水利科学研究院土工研究所,南京,210024 |
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| 基金项目： | 水利部公益性行业科研专项经费项目，国家杰出青年科学基金项目 |
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| 摘 要： | 以筑坝反滤料的室内中型动三轴试验结果为基础,运用离散单元法中的二维颗粒流方法建立了轴对称数值试样模型,通过控制加荷过程中试样体积不变的方法,模拟了不排水加载条件下反滤料的动模量和阻尼比试验。调整颗粒的细观接触参数,与真实试验结果进行比较分析,在得到符合实际结果的宏观力学响应的同时,分析了配位数、孔隙率和超孔隙水压的变化,并从微观角度对动三轴试验进行了探讨。讨论了固结比和密实度对动模量的影响,认为粗粒反滤料的固结比对最大动模量的影响比较符合H ard in推导公式的结果。结果表明,颗粒流方法可以较好地模拟反滤料的动模量和阻尼比试验,试验过程中微观方面的表现也符合实际室内试验的规律。
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| 关 键 词： | 数值模拟 动模量 阻尼比 接触参数 固结比 |
Simulation of Dynamic Modulus and Damping Ratio Test on Filter Material by Particle Flow Code |
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| LIU Han-long,GAO De-qing,CHEN Yu-min,LI Guo-ying.Simulation of Dynamic Modulus and Damping Ratio Test on Filter Material by Particle Flow Code[J].Journal of Disaster Prevent and Mitigation Eng,2009,29(4):361-367. |
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| Authors: | LIU Han-long GAO De-qing CHEN Yu-min LI Guo-ying |
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| Institution: | LIU Han-long1,GAO De-qing1,CHEN Yu-min1,LI Guo-ying2(1.Key Laboratory for Ministry of Education for Geomechanics and Embankment Engineering,Geotechnical Research Institute,Hohai University,Nanjing 210098,China,2.Geotechnical Department,Nanjing Hydraulic Research Institute,Nanjing 210024,China) |
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| Abstract: | According to dynamic triaxial test of the filter material,the 2D particle flow code approach of discrete element method is applied to generate numerical sample to simulate the dynamic shear modulus and damping ratio test,and the undrained condition is performed by maintaining the volume unchanged.The suitable behavior is obtained by adjusting micro-contact parameters and comparing with the real test result.The micro analysis of dynamic triaxial test is exerted by monitoring coordinate number,porosity and ex... |
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| Keywords: | numerical simulation dynamic modulus damping ratio contact parameter consolidation ratio |
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