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为了研究石灰改良粉质粘土的击实特性规律,通过重型击实试验分析得到最佳含水率及最大干密度在不同石灰掺量下的变化规律,并进行扫描电镜分析研究石灰改良粉质粘土的微观结构。通过对试验数据的分析,得到随石灰掺量的增加,土的最佳含水量增加、最大干密度减小的规律。通过对扫描电镜照片的分析,得到掺入石灰后,大孔隙减小且孔隙数目增多,土体颗粒粒径减小,团聚体数目增多的结论。这些微观结构的改变,使得击实过程中土体的含水量、有效击实功、土体性质、粒径大小和级配发生变化,进而影响土体击实效果。
In order to study the compaction characteristics of lime-modified silty clay, the variation law of the optimum moisture content and the maximum dry density under different lime contents was obtained through heavy compaction test and analyzed by scanning electron microscopy to study the effects of lime-modified silty clay micro structure. Through the analysis of experimental data, with the increase of lime content, the optimum moisture content of soil increases and the maximum dry density decreases. Through the analysis of the SEM images, after lime incorporation, the macropores decreased and the number of pores increased, the size of soil particles decreased and the number of aggregates increased. The changes of these microstructures make soil moisture content, effective compaction work, soil properties, particle size and grading change during compaction, which will affect soil compaction.