Predicting the radius injection of soil improvement process using Microbially Induced Calcite Precipitation (MICP)

Articles in Press

Document Type : Research Article

Authors

1 Associate professor at Razi University, Kermanshah, IRAN

2 Water engineering group, Water engineering college, Razi university, kermanshah,Iran

3 Department of civil Engineering, Razi university, Kermanshah, Iran

Abstract

Biological soil improvement using Microbially Induced Calcium Precipitation (MICP) is considered a novel method in the field of soil improvement, especially in predominantly sandy soils. Due to its environmental compatibility, this method falls under the category of green soil improvement techniques and has garnered significant attention from researchers in recent years. However, due to the novelty of this field, most research conducted is at the laboratory scale, highlighting a lack of realistic physical models in studies. In the current study, the injection process into the soil for different fluids is being investigated. Initially, water injection into the soil using a limited volume method is simulated and the results are compared with modelling outcomes performed in seep/w software, demonstrating the accuracy of the limited volume method in estimating water movement around the injection pipe.

In the next step, the injection of bio-slurry and its movement in the soil matrix is simulated using the finite volume method. The results are compared with those of a physical model created under laboratory conditions. Adjusting the Richards equation to estimate the permeability coefficient radially around the injection site has led to a simulation closely resembling the actual injection of bio-slurry into the soil. The advancement rate of the saturation front for bio-slurry is slower than that of water, and over time, the positional difference of the injection radius between these two fluids becomes more apparent.

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Amirkabir Journal of Civil Engineering

Articles in Press, Accepted Manuscript
Available Online from 25 May 2025

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