| 颗粒物质在微剪切振动下的能量耗散研究 |
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| 引用本文： | 汪盼盼,王万景,刘长松,朱震刚.颗粒物质在微剪切振动下的能量耗散研究[J].岩土力学,2009,30(Z1):129-134. |
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| 作者姓名： | 汪盼盼 王万景 刘长松 朱震刚 |
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| 作者单位： | 中国科学院固体物理研究所,材料物理重点实验室,合肥,230031 |
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| 基金项目： | 国家自然科学基金资助项目 |
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| 摘 要： | 采用改进的低频内耗仪研究了几种常见颗粒体系(沙子、玻璃珠)的相对能量耗散性质:能量耗散的振幅谱和频率谱.实验发现,振幅谱中随振幅增大形成一个能量耗散峰,而频率谱线中则观察到随着频率的增加依次出现四个能量耗散峰,对应着体系模量的四个衰减.随探针插入深度的增加相对能耗先增加后减小,出现一个能耗峰值,该峰值对应的深度为体系的临界深度.基于对颗粒体系的介观分析,提出一个流变模型来阐述流变耗散机制,结果表明摩擦在颗粒力学响应中除耗散能量外还起到增加体系弹性的作用.频率谱的分析表明颗粒中还存在另一种耗散机制:颗粒链的共振耗散.
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| 关 键 词： | 颗粒物质 能量耗散 力链 |
| 收稿时间： | 2009-05-10 |
Research on relative energy dissipation in sheared granular materials |
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| WANG Pan-pan,WANG Wan-jing,LIU Chang-song,ZHU Zhen-gang.Research on relative energy dissipation in sheared granular materials[J].Rock and Soil Mechanics,2009,30(Z1):129-134. |
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| Authors: | WANG Pan-pan WANG Wan-jing LIU Chang-song ZHU Zhen-gang |
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| Institution: | Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China |
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| Abstract: | Using a developed low frequency inverted torsion pendulum, the relative energy dissipation in sheared granular materials is investigated. The amplitude and the frequency spectra of fine sand and glass beads are measured. The results show that with the increase of amplitude, one peak of energy dissipation is found in amplitude spectra; while with increasing frequency, four peaks of energy dissipation are observed in the curves of frequency spectra, corresponding to four decreases of the relative modulus. And there exists a peak (corresponding to a critical depth) in the curves of relative energy dissipation along with the inserted depth of probe with different oscillating amplitudes. Based on the mesoscopical analysis of granular materials, a rheological model is presented to explain the rheological dissipation mechanics; and the results indicate that the friction among particles not only dissipates the energy but also enhances the elasticity of the system. The frequency spectra of fine sand reveal a different dissipation: the resonant dissipation. |
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| Keywords: | granular material energy dissipation force chain |
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