| 玻璃球动弹性模量特性试验和数值模拟研究 |
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| 引用本文： | 张成朋,杨贵,刘汉龙,孙逸飞.玻璃球动弹性模量特性试验和数值模拟研究[J].地震学刊,2014(1):34-39. |
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| 作者姓名： | 张成朋 杨贵 刘汉龙 孙逸飞 |
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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,南京210098 [2]河海大学安全与防灾工程研究所,南京210098 |
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| 基金项目： | 国家自然科学基金项目（U1134207,51109068）资助 |
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| 摘 要： | 堆石料颗粒形状较为复杂,且存在明显的颗粒破碎特征。为剔除颗粒形状对堆石料动力特性的影响,在不考虑颗粒破碎的情况下,采用玻璃球模拟堆石料进行动三轴试验,分析了试验围压对玻璃球动弹性模量的影响。基于动三轴试验成果,开展了细观数值模拟研究。研究表明：玻璃球的动弹性模量变化规律与堆石料的基本一致;三维颗粒流方程能较好地模拟该材料的动弹性模量特性;随着粗细颗粒直径跨度增大,试样级配关系增强,最大动弹性模量随之增大;细颗粒直径变小和粗颗粒直径变大都将引起最大动弹性模量的增大。试样的动弹性模量随着细观剪切模量的增大而增大,近似为幂函数关系,动应变降低。
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| 关 键 词： | 玻璃球 颗粒流 动三轴试验 动弹性模量 |
Experimental and Numerical Simulation of Dynamic Elastic Modulus Properties of Crystal Ball |
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| ZHANG Cheng-peng,＇,YANG Gui,＇,LIU Han-long,＇,SUN Yi-fei.Experimental and Numerical Simulation of Dynamic Elastic Modulus Properties of Crystal Ball[J].Journal of Seismology,2014(1):34-39. |
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| Authors: | ZHANG Cheng-peng ＇ YANG Gui ＇ LIU Han-long ＇ SUN Yi-fei |
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| Institution: | 1＇2 (1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China 2. Engineering Safety and Disaster Prevention Institute, Hohai University, Nanjing 210098, China) |
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| Abstract: | The shape of rockfill material paticle is highly complicated, and there is an obvious charateristic of grain crushing. To eliminate the influence of paticlesr shape on the dynamic char- acteristics of rockfill material, the study of dynamic triaxial test on crystal ball was conducted un- der the condition of without considering particle breakage, and the influence of test confining pressure on dynamic elastic modulus of crystal ball was analysed. Based on the results of dynamic triaxial test, mesoscopic simulation was carried out. Study shows： the change law of dynamic e- lastic modulus of both crystal ball and rockfill material is identical basically, three-dimensional particle flow program can simulate the dynamic elastic modulus of this kind of material; along with the increase of grain diameter span, the sample grading relationship enhances, and the maxi- mum dynamic modulus of elasticity increases, both diminishing the diameter of the small parti- cles and largening the diameter of the big particles can lead to increase of the maximum dynamic modulus of elasticity. Along with the increase of mesoscopic shear modulus, the dynamic modu- lus of elasticity increases according to approximate power function relationship and the dynamic strain decreases. |
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| Keywords: | crystal ball particle ＇flow dynamic triaxial test dynamic modulus of elasticity |
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