粗粒料动三轴试验颗粒流模拟对称性研究

英文篇名：Study on the symmetry of dynamic triaxial test of coarse aggregates by PFC
中文刊名：世界地震工程
英文刊名：World Earthquake Engineering
作者：杨贵 ; 刘汉龙 ; 任青文
英文作者：YANG Gui1 ; 2 ; 3 ; LIU Hanlong1 ; 3 ; REN Qingwen2(1.Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering ; Hohai University ; Nanjing 210098 ; China ; 2.Department of Engineering Mechanics ; Hohai University ; Nanjing 210098 ; China ; 3.Engineering Safety and Disaster Prevention Institute ; Hohai University ; Nanjing 210098 ; China)
中文关键词：动三轴试验 ; 对称性 ; 颗粒流模拟 ; 动剪切模量 ; 阻尼比
英文关键词：dynamic triaxial test ; symmetry ; PFC simulation ; dynamic shear modulus ; damping ratio
出版日期：2010-12-15
机构：河海大学岩土力学与堤坝工程教育部重点实验室;河海大学工程力学系;河海大学安全与防灾工程研究所;
年：2010
期：S1
出版单位：世界地震工程

摘要

以粗粒料动三轴数值模拟为例,分析了不同对称模型(1/2,1/4,1/8,1/12)条件下,粗粒料动剪切模量和阻尼比的变化规律。计算结果表明,不同对称模型的计算结果存在一定的差异,但其变化规律基本一致,随着模型对称比例的增大动剪切模量逐渐增大,阻尼比逐渐减小,计算时间成倍减少。分析了颗粒生成过程中不均匀性对试验结果的影响。计算结果表明:1/8模型动剪切模量和阻尼比影响较小;1/12模型动剪切模量影响较大,阻尼比影响较小。建议在动力分析过程中采用1/8模型即可。
Taking dynamic triaxial simulation of coare aggreqates for example,the dynamic shear modulus and damping ratio are studied by different symmetric models(1/2,1/4,1/8,1/12).The results show that there are differences in simulating results of dynamic shear modulus and damping ratio in different symmetric models but the change laws remain the same.With the increase of symmetric ratio,dynamic shear modulus increases and damping ratio decreases,and the calculation time reduces greatly.The initial particle random distribution is studied in 1/8 and 1/12 models.The results show the dynamic shear modulus and damping ratio of 1/8 model and the damping ratio of 1/12 model are not influenced by the initial particle random distribution while the dynamic shear modulus of 1/12 model is greatly influenced by the distribution.The 1/8 model is suggested to analyze the dynamic properties of material.

引文

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