Gravel Compaction Pile(GCP) is actively used for soft foundation improvement, since this is able to increase bearing capacity of soft ground and reduce settlement. However, GCP in Korea is de-signed and constructed, based on empirical methods due to and absence of quantitative design methods. Therefore, many researchers are conducting studies on GCP design through field experiment, laboratory experiment and numerical analysis. This study aims to analyze stress and settlement behaviors depending on the ground strength and the replacement ratio by modeling the composite ground improved by GCP through a finite element analysis program, ABAQUS. The composite ground improved by GCP was nu-merically analyzed using the finite element method and when there were changes in ground strength and replacement ratio, the relation between stress-related coefficients and settlement reduction coefficients of the composite ground was analyzed. The analysis finding showed that the increased ground strength and replacement ratio led to the increased stress concentration ratio and the stress-related coefficients in the top rose equally, while the stress concentration ratio reduced. It is thought that designing the composite ground, based on the measurement in the upper level may cause a mistake, because the result differs from other values of individual depths. When the settlement reduction coefficients were analyzed and com-pared with the results of the existing settlement reduction coefficient equation through finite element analysis, also, the two values showed a similar tendency
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