颗粒大小对颗粒材料力学行为影响初探

发布时间：2018-05-10 13:58

本文选题：颗粒大小 + 直剪试验　；参考：《岩土力学》2014年07期

【摘要】：利用一种特殊颗粒材料-玻璃珠进行了一系列室内直剪试验,研究颗粒大小对颗粒材料力学行为的影响。试验一共考虑了3条近乎平行的级配曲线和4种颗粒摩擦情况:干燥状态、水浸润状态、水淹没状态和油浸润状态。试验结果表明,颗粒大小对颗粒材料的力学行为有显著影响,剪胀性随着粒径的增大而增强。为考虑颗粒大小对剪胀性的影响,提出了一种新的剪胀关系式。在该剪胀关系式中,剪胀系数为依赖于颗粒大小和颗粒摩擦等颗粒基本性质的变量。试验研究同时表明临界状态摩擦角随着颗粒大小的增加而增加。此外,从颗粒细观运动的角度提出了颗粒滑动的功能模型,推导出了功能方程,并以此揭示了颗粒大小对临界状态摩擦角影响的细观机制。
[Abstract]:A series of direct shear tests were carried out on glass beads, a special granular material, to study the effect of particle size on the mechanical behavior of granular materials. Three parallel gradation curves and four kinds of particle friction conditions were considered in the experiment: dry state, water infiltration state, water submerged state and oil soaking state. The experimental results show that the particle size has a significant effect on the mechanical behavior of the granular material, and the shear dilatancy increases with the increase of the particle size. In order to consider the effect of particle size on dilatancy, a new shear-expansion relation is proposed. In this relation, the coefficient of dilatancy is a variable dependent on the particle size and particle friction. The experimental results also show that the critical friction angle increases with the increase of particle size. In addition, the functional model of particle sliding is proposed from the point of view of particle mesoscopic motion, and the functional equation is derived, and the mesoscopic mechanism of the influence of particle size on the friction angle of critical state is revealed.
【作者单位】：中山大学岩土工程与信息技术研究中心;香港大学土木系;
【基金】：香港大学基础研究基金(No.10208227,No.10400889) 国家自然科学基金(No.51209237,No.41030747,No.51108472)
【分类号】：TU43

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