Behavior of Buried Rehabilitated Pipe with Shear Deformation of Grounds

Abstract

In recent years, many irrigation pipelines require a repair work by the deterioration. The aging pipelines have a risk for a leakage, a decrease of a capacity of flow and a serious damage during earthquake. As the repair work for aging pipelines, pipe rehabilitation has been used. However, the dynamic behavior of the rehabilitated pipe during earthquake has not been cleared. In this study, in order to clarify an influence of a shear deformation of grounds on the behavior of the buried rehabilitated pipe, shear tests and DEM analyses were conducted. As the results, it was revealed that the degree of the influence of the aging host pipe on the deformation of the rehabilitated pipe was divided into three types according to the damage levels of the host pipe and the relative density of the backfill material. In addition, the prediction equation on the deformation of the rehabilitated pipe to the shear deformation was proposed in consideration of the damage levels of the host pipe, the deformation modulus of the backfill material and the bending ring stiffness of the rehabilitated pipe.