Abstract
A deformation behavior of a buried flexible pipe used as an irrigational pipeline is not substantially clear during earthquake. In this study, in order to clarify an influence of a deformation of ground on the dynamic behavior of the buried flexible pipe, cyclic shear tests for buried flexible pipes having an outside diameter of 140 mm and 150 mm in the laminar box and DEM analyses were conducted. As the results, it was found that the 45-225 and 135-315 degrees deflection of the buried flexible pipe were larger than the 0-180 deg. (vertical) and 90-270 deg. (horizontal) deflection. This tendency became remarkable as the relative density of the backfill material increased. It was indicated that the relationships between the deflection of the pipe and the shear strain obtained from the analyses results could be in good agreement with the test results. In addition, the buried flexible pipe was deformed due to the contact force acted on the oblique direction of the pipe during earthquake.
