ABSTRACT
Compaction grouting (CPG) is an in-situ grout injection technique used to improve the liquefaction resistance of loose sandy ground by densification and increasing lateral confining pressure. The present study investigates ground response during grout injection using a transparent granular soil and a natural sand soil. The injection process was simulated using models placed in a geotechnical centrifuge. The experimental results relating injection pressure to injection depth are shown to be in good qualitative agreement with field data. The results of models using transparent granular soil are shown to be in good agreement with the same models using standard opaque silica sand. The experimental methodology to simulate CPG and to observe grout volumes and ground movements during injection holds promise to better understand the mechanisms of compaction grouting and to improve its efficiency in the field.
