Micp-reinforced soil under three-dimensional grout injection condition

Abstract

The use of microbial-induced carbonate precipitation (MICP) in soil reinforcement has attracted attention in the academic field in recent years. However, most of the existing studies have been conducted based on one-dimensional (1D) grout injection condition. The present study conducted in vitro and sand column experiments of MICP using a ureolytic bacterium (ATCC 11859) (three-dimensional (3D) and 1D models were considered in the sand column experiments) as well as the feasibility and reinforcing effect of the 3D MICP grout injection method. A comparison of the 3D and 1D grout injection methods showed that the specimens reinforced using the 3D grout injection method had higher strength, better homogeneity, a greater CaCO3 content, and a larger permeability coefficient compared with the specimens reinforced using the 1D grout injection method. The limitations of the 1D model should be considered in future practical applications.