VISUALIZATION OF FRICTION MECHANISM AT JOINT PART OF PIPE USING SOIL PARTICLE MODEL

Abstract

 In the guideline for seismic design of buried pipes, the characteristics of the ground spring in the pipe axial direction, which represents the dynamic interaction between the pipeline and ground, are important for evaluating the seismic resistance of the buried pipes under the seismic forces. The ground spring characteristic in the pipe axial direction is modeled as a bilinear type in which the slip occurs between the pipe and ground if the shear stress exceeds a certain limit. However, the buried pipe has joints, and the friction in the pipe axial direction includes the friction due to the joint’s overhanging part, but their modeling has not been sufficiently studied. In this study, in order to understand the movement of soil particles around the joint when shear displacement is applied, an shear deformation experiment that the pipe and the soil particles are replaced by a two-dimensional cross section was carried out. The movement of soil particles was visualized and the friction mechanism was clarified microscopically.