Abstract: To explore the influence of different factors on the physical and mechanical properties of soft soil improved by enzyme induced carbonate precipitation (EICP) method, curing time, adhesive liquid concentration and urease enzyme activity are established as test variables for comparative study. By measuring the physical and mechanical properties of soil samples under different test options, the influence of different factors on the effect of soft soil by EICP method is analyzed. The test results show that in the process of EICP, urease consumes water, produces calcium carbonate crystals and cemented with soil particles, which slightly increased the density, decreases the water content and increases the shear strength of the soft soil after EICP improvement. EICP method can effectively improve the physical and mechanical properties of soft soils. Different test variables have different effects on the improvement effect of soil, which can provide theoretical basis and test support for future projects.

Key words: Enzyme Induced Carbonate Precipitation, Density, Moisture Content, Shear Strength, Soft Soil Improvement