TANG Liansheng, XIA Han, SONG Jing. 2015: THE CHARACTERISTICS OF DRAINAGE CHANNELS EVOLUTION IN SOFT SOIL UNDER VACUUM PRELOADING. JOURNAL OF ENGINEERING GEOLOGY, 23(s1): 179-183. DOI: 10.13544/j.cnki.jeg.2015.s1.028
    Citation: TANG Liansheng, XIA Han, SONG Jing. 2015: THE CHARACTERISTICS OF DRAINAGE CHANNELS EVOLUTION IN SOFT SOIL UNDER VACUUM PRELOADING. JOURNAL OF ENGINEERING GEOLOGY, 23(s1): 179-183. DOI: 10.13544/j.cnki.jeg.2015.s1.028

    THE CHARACTERISTICS OF DRAINAGE CHANNELS EVOLUTION IN SOFT SOIL UNDER VACUUM PRELOADING

    • When vacuum preloading is performed on soft soil, changes in particle aggregates, void sizes and microstructure directly influence the consolidation process of the soft soil. In this paper, the marine soft soil sampling from south China coastal was adopted in the research.laboratory small-scale tests and scanning electron microscopy(SEM)tests were conducted to investigated the drainage mechanism of the soft soil. In addition, the fractal method was used to simulate evolution process of the drainage channels in the soft soil. In the initial stage of vacuum preloading, the drainage channels were developed and water was strongly attracted by vacuum suction. Therefore, the drainage channels could be deemed as straight pipes. In the subsequent stage, drainage channels shrank, enhancing the influence of soil particle adsorption. The water flow carrying tiny soil particles might be slowed down, leading to a higher adsorbed water content.the viscosity of adsorbed water and adsorb ability of fine particles gradually caused the blockage in drainage channels. At last, the drainage channels narrowed(even closed) and formed a mutually staggered grid. The soil showed obvious anisotropy and heterogeneity. Drainage process of the soft soil under vacuum preloading is essentially the process of the block up of the original drainage channels, followed by the formation of new drainage channels. A depth research in of microstructural change of soft soil in the reinforcement is advantageous for safe construction and operation of the engineering structure on the soft soil.
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