刘方成, 吴孟桃, 王海东. 2019: 粒径比和配比对橡胶砂力学性能的影响研究. 工程地质学报, 27(2): 376-389. DOI: 10.13544/j.cnki.jeg.2017-612
    引用本文: 刘方成, 吴孟桃, 王海东. 2019: 粒径比和配比对橡胶砂力学性能的影响研究. 工程地质学报, 27(2): 376-389. DOI: 10.13544/j.cnki.jeg.2017-612
    LIU Fangcheng, WU Mengtao, WANG Haidong. 2019: EFFECT OF PARTICLE SIZE RATIO AND MIX RATIO ON MECHANICAL BEHAVIOR OF RUBBER-SAND MIXTURES. JOURNAL OF ENGINEERING GEOLOGY, 27(2): 376-389. DOI: 10.13544/j.cnki.jeg.2017-612
    Citation: LIU Fangcheng, WU Mengtao, WANG Haidong. 2019: EFFECT OF PARTICLE SIZE RATIO AND MIX RATIO ON MECHANICAL BEHAVIOR OF RUBBER-SAND MIXTURES. JOURNAL OF ENGINEERING GEOLOGY, 27(2): 376-389. DOI: 10.13544/j.cnki.jeg.2017-612

    粒径比和配比对橡胶砂力学性能的影响研究

    EFFECT OF PARTICLE SIZE RATIO AND MIX RATIO ON MECHANICAL BEHAVIOR OF RUBBER-SAND MIXTURES

    • 摘要: 橡胶砂作为一种新型的廉价隔震材料具有广泛的应用前景,其力学变形特性受两种母材的配合比、粒径比等影响较大。为促进橡胶砂的工程应用,对3种粒径比、6种配比橡胶砂进行了一系列双轴压缩离散元模拟试验,从宏细观角度研究了胶-砂粒径比对橡胶砂力学行为的影响。结果表明:(1)橡胶砂应力-应变曲线在小应变下表现为近似线性增长关系,随着橡胶含量的增加,偏应力逐渐减小,减小程度随粒径比的增大而减弱;(2)随着橡胶颗粒含量的增加,橡胶砂模量降低、应力-应变曲线向硬化型转变、线性关系增强,粒径比越大,硬化特性越明显;(3)随着橡胶颗粒含量的增加,橡胶砂剪胀特性减弱、剪缩增大,粒径比越大,剪缩程度越明显;(4)橡胶砂应力-应变关系可用扩展邓肯-张模型进行模拟,模型参数受粒径比和橡胶颗粒含量影响的规律明显;(5)橡胶砂力学特性受粒径比影响的细观机制可由颗粒接触特性、颗粒配位数、力链分布、能耗发展等变化情况来描述。

       

      Abstract: Rubber-Sand Mixture(RSM)has recently been demonstrated to be a new type of low cost isolation material with wide application. The mechanics and deformation characteristics of RSM can vary with mix ratio and particle size ratio of the two base materials. In order to promote the engineering application of RSM, a series of biaxial compression tests are conducted numerically on three kinds of particle size ratio and six kinds of mix ratio based on DEM simulation. Influence mechanisms of particle size ratio on macroscopic and mesoscopic characteristics are analyzed. Results indicate that:(1)The stress-strain curves of RSM show a linear growth relationship under small strain. With the increase of rubber content, the deviator stress and its degree decrease with increase of particle size ratio. (2)With the increase of rubber content, the modulus of RSM decreases, and the hardening characteristics of specimen is enhanced. The larger the particle size ratio, the more evident the degree of hardening. (3)With the increase of rubber content, volumetric expansion of RSM is decreased, and the contraction characteristics of specimen is enhanced. The larger the particle size ratio, the more evident the degree of contraction. (4)The stress-strain behavior of RSM can be simulated well with the extended Duncan-Chang hyperbola model, and the influence of particle size ratio and rubber particle content on model parameters is obvious. (5)The mesoscopic mechanism of the effect of particle size ratio on RSM can be described by these factors including particle contact characteristics, particle coordination number, force chain distribution, and energy consumption development.

       

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