Numerical Modelling of Pipeline Leakage Effect on the Structural Capacity of Flexible Pavement

Abstract: The economic importance of using pipelines to transport essential and waste materials to and from end-users cannot be overemphasized. These materials, which include water, sewage, crude oil, etc., rely on efficient transportation methods; therefore, both proper supply and disposal must be carried out appropriately. The transportation system of these goods often intersects with highway structures, leading to pipelines being buried within pavement structures. Over the years, conflicts between the pavement structures and the pipes buried within them have been observed. These conflicts have resulted in both environmental and economic losses, such as the waste of essential resources like water, groundwater pollution from sewage, and the structural failure of pavements. Various studies have identified several causes of these conflicts, including the depth at which pipelines are buried, the type of pipe used, and the type of pavement structure involved. Despite these findings, the issues persist and thus need to be addressed from a different perspective. This study, utilizing the Coupled Eulerian-Lagrangian technique for fluid-structure interaction within a finite element modelling tool, evaluates the impact of pipeline leakages on the structural capacity of the pavement when maintenance is delayed. Ultimately, this study will help in understanding the extent of road damage that may require maintenance following a pipeline leakage within the pavement structure.