Abstract
The sand compaction pile (SCP) method is the most commonly used soil improvement techniques. In present design of the SCPs method, the SCPs are assumed to be fully penetrated up to the bottom of the clay deposit. However, there are many cases where the SCPs are partly penetrated to the bottom of the clay deposit because of the construction cost, the capacity of construction equipments and other factors. In this research, a series of model tests was carried out in order to clarify the consolidation behavior of the clay ground improved by the partly and fully penetrated SCPs. As the results, it was found that the stress concentration ratio of model ground improved by partly penetrated SCPs varied with time and depth and this ratio was dependent on the penetration depth of SCPs.
