Strain-based and stress-based assessment comparison for a buried gas transmission pipeline caught in a ground movement

摘要

This paper presents a real case of a gas transmission pipeline caught ina slow ground movement (caused by a channel dyke collapse) assessedwith both strain and stress-based methods. The pipeline has beensubjected to a ground movement induced displacement for over 30years and slow settlement is evaluated at the time horizon of 2040.Extensive soil testing as well as a time and space interpolation havebeen performed in order to establish a representative pipe-soilinteraction model. Settlements have been measured over the years andin situ measurement devices are still sending information about thepipeline displacements.These tests coupled with the appropriate modeling allowed GRTgaz toreduce greatly the cost of mitigation measures following the dykecollapse provided that CRIGEN recommendations are followed.