CFD-DEM analysis for filtration and penetration of cement-based grout

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The filtration and penetration mechanism of cement-based grout have not been clarified sufficiently yet due to complicated physical and chemical processes of grouting. Therefore, the grout material and injection parameters are usually determined empirically by technical experts at the injection site. In this research, to better understand the penetration and filtration mechanism of cement-based grout through rock fractures, a two-dimensional numerical model of coupled Computational Fluid Dynamics and the Distinct Element Method (CFD-DEM) had been developed. As a result, the filtration process during the injection of cement-based grout was successfully reproduced by the CFD-DEM code. Based on these results, the factors that significantly influence on the filtration and penetration mechanism was investigated in detail. The numerical model developed in this research gave a better understanding for filtration and penetration mechanism of cement-based grout.