Abstract
In this study, we compared the stability of embankments constructed using a composite ground improvement (CGI) technique, we developed and the conventional deep mixing method with an improved ratio of 30%. they were subjected to dynamic centrifugal model test to assess their resistance to level-2 seismic motion. As a result, cracking was found on the crown of the embankment constructed using the conventional method and settlement of the surface was observed. By contrast, cracking and settlement were undetected in the crown of the embankment constructed using the CGI technique. In addition, no lateral flow of the embankment into the adjacent ground was detected. These results indicated embankments built using the CGI technique can withstand level-2 seismic motion.
