State -of -the -art report soil improvement with bio-grouting materials

In recent years, the cross -discipline of geotechnical engineering, microbiology and chemistry has shown good competitiveness in issues of modified soil. Microbial grouting material is a new type of modified soil material developed recently. By pouring bacterial liquid and nutrition into loose sand and using microbial mineralization to rapidly precipitate carbonate between sand particles, the physical and mechanical properties of soil are improved. This paper mainly summarizes the research of many scholars on the modified soil of biological grouting materials in recent years, and expounds the microbial -induced carbonate precipitation in biological grouting. The application and soil modification mechanism of three kinds of biological grouting materials: enzyme -induced carbonate precipitation and bio-induced carbonate dehydration and precipitation, and points out the great application prospect of biological grouting materials in geotechnical engineering and the problems to be solved in the future.