DISCRETE ELEMENT ANALYSIS OF SOIL-PIPE INTERACTION SUBJECTED TO NORMAL AND REVERSE FAULTING
Keywords:Buried pipeline, Soil-pipe interaction, Fault movement, Discrete element method, Finite element method
Buried pipelines are an essential component of lifelines. However, they are repeatedly damaged by earthquakes. Fault displacement is a significant cause of damage to buried pipelines. In this study, the response of buried pipelines to reverse fault, normal fault, and vertical dislocation was evaluated using the discrete element method (DEM), which can model the details of the nonlinear behavior of the ground. The characteristics of the deformation, bending moment and axial force of the buried pipe for each fault type are clarified about the burial depth. For comparison, a finite element analysis using soil springs was also performed. The results showed that the response of the buried pipe was significantly different from that of the DEM because the deformation of the ground surface could not be considered in the FEM analysis. For finite element analysis with soil springs for the practical design of buried pipes subjected to fault displacement, it is necessary to improve the model of soil springs.