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土的物理力学性质的差异或变化取决于土的微观结构。路基强度与变形的破坏,其根本原因是出自于土体内部结构的复杂性。以扫描电镜和数字图像处理系统为工具,定性和定量分析了不同含水率条件下击实黄土的微观结构特征。结果表明,不同含水率条件下,击实黄土的平均孔隙直径、平均孔隙面积和平均孔隙周长在最佳含水率下达到最小值。随着含水率的增大,击实黄土大、中孔隙的含量减小,微、小孔隙的含量增多。其微结构模型也发生相应的变化:松散集粒结构→紧密集粒结构→镶嵌结构→紊流结构→定向排列结构。
The differences or changes in the physical and mechanical properties of soils depend on the microstructure of the soil. Subgrade strength and deformation of the destruction, the root cause is derived from the complexity of soil structure. Scanning electron microscope and digital image processing system were used as tools to qualitatively and quantitatively analyze the microstructure characteristics of compacted loess under different moisture content. The results show that the average pore diameter, the average pore area and the average pore circumference of compacted loess reach the minimum under the optimal moisture content under different moisture content. With the increase of moisture content, compacted loess is large, the content of mesopores decreases, and the content of micropores and micropores increases. Its microstructure model also changes correspondingly: loose aggregate structure → dense aggregate structure → mosaic structure → turbulence structure → directional arrangement structure.