不同固结压力下膨胀土微观结构的演化过程研究
首发时间:2017-08-28
摘要:利用扫描电子显微镜(SEM)研究不同固结压力下膨胀土的微观结构,基于ArcGIS数字图像处理技术研究原状土、重塑土和石灰改良土在不同固结压力下孔隙比、三维分形维数、圆形度及形状系数的演化规律。图像处理分析表明,在三维空间基于灰度值法可以较好的分析不同固结压力下土体的孔隙比;在一定固结压力范围内,随着压力的增加,土体微观结构单元体的分形维数与固结压力存在较好的线性关系;随着固结压力的增加,单元体的熵、圆形度、形状系数先增加再减小。研究结果揭示了土体微观结构与宏观固结压力之间存在的相关关系。同时,从土体微观结构参数演化的过程,说明了石灰对膨胀土改良的效果。
关键词: 膨胀土 固结压力 电镜扫描 微观结构 改良土 演化过程
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Study on gradual changed microstructure of expansive soil under different consolidation pressure
Abstract:Study on microstructure of expansive soil under different consolidation pressure with scanning electron microscope (SEM) and study on undisturbed soil, remolded soil and lime improved soil void ratio , the three-dimensional fractal dimension, circular degree and the shape factor based on ArcGIS digital image processing technology analysis the regularity of the evolution. The analysis of image processing shows that the void ratio of soil can be analyzed by grey value method in the three dimensional space under different consolidation pressure. In a certain consolidation pressure range, there is a linear regression relationship between fractal dimension of the soil particles and the consolidation pressure with the increase of pressure. The directional entropy, circular degree and shape factor of the soil particles increases first and then decreases with the increase of consolidation pressure. Research shows that the microstructure of soil structure and the correlation have a relation. At the same time, the evolution process of soil microstructure illustrates the effects of the lime for improving expansive soil.
Keywords: expansive soil consolidation pressure scanning electron microscope microstructure improved soil course of evolution
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