ESTIMATION OF THE SETTLEMENT OF IMPROVED GROUND WITH A COMBINED TECHNOLOGY OF SHALLOW STABILIZATION AND FLOATING -TYPE CEMENT TREATED COLUMNS

Abstract

A combined technology of shallow stabilization and floating-type cement treated columns has been developed as method with acceptable settlement for maintaining the function of the high standard roads or high embankments on soft ground. So it is important to predict settlement of this type improved ground. In this study, a composite spring model for predicting the total settlement of this type improved ground is proposed with consideration of settlement reduction effect in relation with improved parameters such as improvement ratio and improved depth. Coefficient of volume compressibity of the improved portion and total settlement are derived by this proposed model. Its validity is confirmed from the one-dimensional consolidation tests and loading model tests with the plane strain conditions.