Study the Behavior of Flexible Pipes Considering the Dilatancy Effect of Sand

This chapter delves into the behavior of flexible pipes under the influence of sand dilatancy, a critical factor often overlooked in traditional design methods. By combining the Iowa equation with stress-dilatancy theory and critical state soil mechanics, the study provides a comprehensive analysis of how sand dilatancy affects pipe deformation and stress distribution. Key findings include the significant reduction in vertical deflection and increased lateral support offered by dense sand, particularly as burial depth increases. The research highlights the limitations of conventional methods like the Marston method and the Iowa equation, which tend to underestimate lateral support from dilatant soils. Through computational modeling and sensitivity analysis, the study demonstrates the crucial role of burial depth and soil void ratio in pipe performance. The results underscore the importance of integrating dilatancy effects into pipeline design to enhance safety and longevity. This chapter offers valuable insights for professionals seeking to optimize the design and installation of flexible pipelines in sandy soils.