Abstract
Tokyo International Airport was constructed on the offshore reclaimed land, where a liquefaction phenomenon will occur in many areas due to a strong earthquake motion. As for the countermeasure against the liquefaction, the static compaction grouting method (CPG method) has been adopted to this airport. The design of the improvement area and ratio in that method requires that ground surface displacement calculated by a dynamic numerical analysis results within the allowable value. Therefore, the suitable modeling method in numerical analyses is needed for the accurate design. In this paper, the new modeling method of ground improved by the CPG method is proposed to model the specific stress condition which was observed in the construction experiment. In addition, a series of dynamic numerical analyses by involving the above modeling method was conducted to investigate the improvement effect, such as the ground surface displacement.
