Biomediated soil improvement utilizes certain bacteria to precipitate calcite among soil particles

which has a bright prospect because it is in accordance with the requirements of sustainable development. The existing research results mainly focused on improving the soil composed of coarse particles such as sand; however

the fine-grained soil formed in different environments has not been well investigated. In the present study

bio-grouting experiments using Sporosarcina pasteuring were conducted to treat the marine silt collected from the eastern coastal areas of Jiangsu

China. The influences of environment temperature

pH value

the content of chlorate

and the contents of cementing cations were analyzed by quantitative tests in laboratory. The results indicated that the calcium carbonate precipated in the soil specimen increased with the rise of temperature

but the unconfined compression strength had a peak value instead of a linear increase with temperature. The meta-alkalescence environment is favorable for the work of Sporosarcina pasteuring; nevertheless

the reinforcement effect may be affected if the pH is too high.An exorbitant content of chlorate salt in the soil would prevent the activity of bacteria

and thus had an adverse impact on the strength of sample. The influence of cementing cation concentration in soil was so small that could be ignored. The research results may provide an effective guidance for actual soil grouting reinforcement using the method of microbial induced calcite precipitation.