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通过电镜扫描试验与图像分析手段,对加载前、后不同土性及不同水泥掺量的加固黏性土微观结构进行研究,定量分析其微观孔径大小、孔隙形状系数以及孔隙定向角等参数变化的影响,并探索其与加固土体强度及承载机制的关系。研究结果表明:(1)水泥黏性加固土在加载前、后孔径分布和孔隙形状系数呈现出不同的规律,水泥掺量小(5%)的加固土加载后孔径减小,孔隙形状系数增大,宏观表现为剪缩;而水泥掺量高(20%)的加固土加载后整体孔径增大,孔隙形状系数减小,宏观表现为剪胀;(2)水泥黏性加固土体无论其水泥掺量的高低,在加载过程中,其颗粒或团粒均在内部应力作用下发生定向性的滑移或转动,从而导致孔隙长轴方向发生改变,孔隙定向角分布由均匀变为集中,孔隙定向性趋于显著。
The microstructure of clayey soils with different contents of soil and cement before and after loading was investigated by scanning electron microscopy (SEM) and image analysis. The changes of microscopic pore size, pore shape coefficient and pore orientation angle were quantitatively analyzed Influence and explore its relationship with the strength of reinforced soil and bearing mechanism. The results show that: (1) The pore size distribution and pore shape coefficient of cementitious clay show different rules before and after loading. The pore size decreases with the increase of cement content (5%), the pore shape coefficient increases Large and macroscopically showed shrinkage and shrinkage; while the soil with high cement content (20%) increased the overall pore size, the pore shape coefficient decreased and macroscopically showed dilatancy; (2) During the loading process, the particles or agglomerates of the cement are oriented or slipped or rotated under the action of internal stress, which leads to the change of the direction of the long axis of the pores and the distribution of the directional angle of the pores from uniform to concentrated pores Directivity tends to be significant.