A Study on the Bedding Effects of Deteriorated Existing Sewage Pipes on the Close-fit Non-bonded Flexible Linings and its Mechanism

摘要

Focused on the bedding effects of the existing host pipe on the close-fit non-bonded flexible linings for pipelinernrehabilitation, in this study, earth pressures and deformation behavior of flexible pipe liners for different deterioratedrnconditions of the host pipes were investigated through a full-scale loading test, a series of centrifugernmodel tests and FEM numerical analyses. The bedding effects of the host pipe were quantitatively analyzed. Itrnwas made clear that the external loads acting on the flexible pipe liners were mitigated, since the deterioratedrnhost pipe partially supported the external loads in response to the deterioration degrees, such that the bendingrnstrain and vertical deflection of the flexible pipe liner were reduced. A reasonable design methodology for thernclose-fit non-bonded flexible linings for pipeline rehabilitation should reflect such bedding effects.