Sustainable technique to improve undrained shear strength of soil by using Bacillus Subtilis bacteria

Abstract As population grows, more land areas are used up for accommodation, industrial needs as well infrastructure. This results in diminishing availability of soil with good characteristics that can be used. limitation forced future construction to built on soils poor characteristics. These types require improvement order make them viable construction. A relatively new and sustainable method is bio-grouting techniques. The effectiveness improve organic sandy silt studied this paper. Cylindrical samples 3.5 cm diameter 7 height improved by spraying bacteria solution at different solution-to-sample mass ratio varying proliferation period. varied from 0.2% - 1%, while the period three durations, i.e., 5 days, 13 21 days. showed applied could form calcite obtain an increase strength. For days period, optimum 0.6%, 0,8%. However, 0.4% 0.6% shows comparable degree 0.8%.