冻融作用下粉砂土微观结构变化对宏观力学参数的影响研究

发布时间：2018-03-28 04:40

本文选题：道路工程　切入点：粉砂土路基　出处：《公路》2017年10期

【摘要】：土的宏观力学行为究其原因是微观结构的外在反映。为了研究粉砂土微观结构在冻融循环作用下的变化对宏观力学特性的影响规律,通过对不同含水量下粉砂土的平均粒径、粒度分维、颗粒定向概率熵、颗粒起伏分维、平均孔径、平均丰度、孔径分维、平均圆形度等8个微观参数的观测,基于灰色关联理论,分析了微观结构特性与粉砂土的内摩擦角、黏聚力以及粉砂土路基抗剪强度等宏观力学行为的关联性。研究结果表明:平均丰度、平均孔径与内摩擦角的关联性较大,关联度大于0.64;平均粒径、粒度分维、颗粒定向概率熵与黏聚力的关联性较大,其关联度大于0.64;平均粒径、定向概率熵、粒度分维、颗粒起伏分维与粉砂土路基抗剪强度关联性较大,关联度大于0.64,其中平均粒径、定向概率熵与粉砂土路基抗剪强度的关联度大于0.8,说明二者与粉砂土路基抗剪强度密切相关。
[Abstract]:In order to study the influence of the microstructure of silty sand on the macroscopic mechanical properties under the action of freeze-thaw cycle, the average particle size of silty sand under different water content was studied. Particle size fractal dimension, particle orientation probability entropy, particle fluctuation fractal dimension, mean aperture, mean abundance, aperture fractal dimension, mean roundness, etc. The relationship between microstructure characteristics and internal friction angle, cohesive force and shear strength of silty sand subgrade is analyzed. The results show that the average abundance, average pore size and internal friction angle are highly correlated. The correlation degree is greater than 0.64, the average particle size, particle size fractal dimension, particle orientation probability entropy and cohesion are more than 0.64, the mean particle size, directional probability entropy, particle size fractal dimension, the average particle size, the orientation probability entropy, the particle size fractal dimension, The correlation between the fractal dimension of particle fluctuation and the shear strength of silty sand subgrade is greater than 0.64, in which the average particle size, directional probability entropy and shear strength of silty sand subgrade are more than 0.8, which shows that the correlation between them is closely related to the shear strength of silty sand subgrade.
【作者单位】：吉林建筑大学交通科学与工程学院;
【基金】：国家自然科学基金项目,项目编号51308256
【分类号】：U416.1

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