Iron bacteria exist widespreadly in nature, which can be screened to oxidize ferrous iron into hydroxyl complex and produce gelatinous slime with high reactivity and adsorbability. In this paper, microbial technology is introduced for improving silt. The metabolic outcomes and precipitation of iron bacteria can plug mineral lattice crystal and glue the soil granule, simultaneously reduce soil permeability and strength their shear resistance. The engineering characteristics of silt before and after modification are compared by permeability test and CU tri-axial compression test. And the modification mechanism of silt by bio-grouting has been investigated from the perspective of mesoscopic.
Silt, Iron bacteria, Permeability coefficiency, Unconfined compressive strength, Microstructure
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