Pipes are subjected to high stresses during the installation process and when relative movement due to slope instability or subsidence happens. A direct contact between pipe and soil provides the stress magnitude a pipe undergoes, and if those stresses are higher than pipe strength, damages such as cracks, breakage can occur. Current research on buried pipeline behavior focuses on predicting pipe jacking forces, studying the pipe-soil interaction, and evaluating results of pipe instrumentation. Numerous numerical and analytical studies have been conducted about the behavior of a pipe under longitudinal axial movement, however, the main focus was to predict axial soil resistance without evaluating the stresses along the pipe length. In this study, a numerical model and an analytical method of load transfer approach are used for the estimation of axial stresses along buried pipeline. The numerical model was developed using the Finite Difference Package FLAC 2D, and was calibrated and validated applying the pipe jacking field results of four coal tar coated pipes. The pipes were buried in an excavated trench and pushed against clayey sand backfill and the other in clayey soils. The results of both approaches are in reasonable agreement with the field data in both soils. Based on the field data, the numerical model and the load transfer results, factors contributing to the stress distribution along a buried pipe are considered to develop a stress prediction model for coal tar coated pipes in clayey sand (SC) soils and in low plasticity clay (CL) soils. The prediction model was verified against two case studies obtained from the literature.
|Commitee:||Huang, Jianwei, Benjankar, Rohan|
|School:||Southern Illinois University at Edwardsville|
|School Location:||United States -- Illinois|
|Source:||MAI 81/3(E), Masters Abstracts International|
|Keywords:||Pipes, Stresses, Pipe-soil interaction, Pipe instrumentation|
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