Uncoupled axial, flexural, and circumferential pipe–soil interaction analyses of partially supported jointed water mains

Abstract

Pipelines used in the distribution of potable water are a vital part of everyday life. The pipelines buried in soil–backfill are exposed to different deleterious reactions; as a result, the design factor of safety may be significantly degraded and, consequently, pipelines may fail prematurely. Proactive pipeline management, which entails optimal maintenance, repair, or replacement strategies, helps increase the longevity of pipelines. The effect of different deterioration mechanisms and operating conditions needs to be understood to develop good proactive management practices. In this paper, a Winkler-type analytical model is developed to quantify the contributions of different stress drivers, e.g., pipe material type and size, bedding conditions, and temperature. Sensitivity analyses indicate that the extent of the unsupported length developed as a result of scour has a significant influence on the flexural pipe–soil response. As well, plastic pipes tolerate less loss of support than metallic pipes.Key words: jointed water mains, Winkler model, pipe–soil interaction, elastoplastic soil.