Abstract
It has been reported that a buried flexible pipe excessively deformed due to the sheet-pile extraction after backfilling. Many studies have been conducted on the design method in consideration of the influence of sheet-pile extraction. However, studies for the aim of establishing methods of reducing pipe deformation are scarce. In this study, a sheet pile pullout tests were conducted to verify the effect of the backfill material integrated using geogrids to prevent the horizontal earth pressure from rapid decreasing, thus suppressing the pipe deformation during sheet-pile extraction. In addition, the separate integration of the base and upper area of the pipe was more effective in suppressing pipe deformation.
