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为揭示真空预压和堆载预压加固软土地基过程中土体微观结构的变化,进一步探究软土加固机理,对温州海底吹填土进行了真空预压试验和堆载预压室内试验,采用电子显微镜研究了2种方法加固软土前后土颗粒的数量、圆形度、直径、丰度及定向性等微观参数的变化.试验结果表明:在真空预压和堆载预压加固软土的过程中土体结构不断调整重组,但加荷方式的差异引起土体结构调整方式不同;真空预压时,土体颗粒重新排列;而堆载预压时,土体颗粒破碎后排列.通过对真空及堆载预压固结过程中土体微观结构变化规律的研究,有助于了解真空预压和堆载预压加固软土的机理与效果.
In order to reveal the changes of soil microstructure during the process of vacuum preloading and preloading compaction of soft soil, the mechanism of soft soil reinforcement was further explored, the vacuum preloading test and preloading preloading test in Wenzhou subsea dredger fill were carried out, The changes of microscopic parameters such as the number of particles, circularity, diameter, abundance and orientation of soil particles before and after the consolidation of soft soil were studied by means of electron microscope.The results show that in the soft soil with vacuum preloading and preloading, The soil structure is continuously adjusted and reorganized, but the difference of loading method causes the different adjustment methods of soil structure. In vacuum preloading, the soil particles are rearranged, while the soil particles are crushed and arranged after the preloading, The research on the change law of soil microstructure in the process of vacuum and preloading compaction is helpful to understand the mechanism and effect of vacuum preloading and preloading consolidation of soft soil.