Abstract
Biocementation of slope soil by using native Cytobacillus horneckiae microorganisms living in Chugoku region, Japan, has been carried out in this research. Slope soil erosion is one of the main geo-disasters and the traditional methods to improve it are not environmentally friendly. In this study, the native microorganisms were used to bio-stabilize the slope soil as an environment-friendly method. Laboratory experiments were conducted to solidify the slope soil by applying bacteria for three weeks in 60 × 20 cm cylindrical mold. One directional direct shear test was conducted for measurement of strength. A model slope was also prepared and solidified with same Cytobacillus horneckiae. The produced calcium carbonate was determined. It was observed that the strength has increased after 21 days of bio-cementation by using the native bacteria for 50,100 and 150 kN/m2 and no strength has increased with non-biocemented samples. The calcium carbonate amount was found maximum around 6 %, which indicated the bio-cementation was possible at the slope while using the Cytobacillus horneckiae.
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