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Microbial induced calcite precipitation (MICP) process has proven to play an active role in modification of in-situ porosity, permeability, and improvement of strength and stiffness of granular unconsolidated soils. Characterization of the resulting alterations in the bio-enhanced porous matrix remains to be a critical gap. This paper is aimed at modeling biological clogging and the resulting geomechanical alterations in a sand sample through a novel numerical scheme. A new tightly coupled numerical model is developed to assess the spatiotemporal geomechanical variations in an unconsolidated sand subjected to MICP treatment. The progress of calcite precipitation is implemented into the model using the Monod-type kinetics rate formulation. The modification in stiffness parameters is predicted using a cementation theory based on time-dependent porosity reduction under cement deposition in the soil matrix.
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