Study on buckling deformation mechanism of pipeline crossing road. (September 2022) - Nie, Hailiang
Highlights: Comparing between the finite element simulation and the actual buckling is aneffective way to determine the loading forms of the buckling. The casing can lead to the redistribution of deformation and the concentration of deformation of pipelines. The variation of ground load will lead to buckling deformation of road crossing pipeline. A small deformation of pipeline will evolve into serious buckling due to the change of ground load and geological disaster. Abstract: As one of the main forms of pipeline deformation and failure, buckling poses a threat to the service safety of pipelines, seriously leads to oil and gas leakage, pipeline shutdown and environmental pollution. It not only brings huge economic losses, but also leads to fire, explosion and other accidents, which threaten the property and life safety of the country and people. Therefore, it is necessary to study the buckling deformation mechanism and failure rule, so as to lay a foundation for the evaluation and protection of pipeline buckling deformation. In this paper, theory and finite element simulation method has been used to study the buckling failure mechanism of the pipeline crossing road. The form and magnitude of the local load causing pipeline buckling are obtained through theory and vilified by the finite element simulation. The analysis results show that the boundary conditions and stiffness of the pipe are locally changed by the casing, and the deformation of the pipe is concentrated under the external load, such as road load and seismic wave, which leads to buckling. Therefore, the existence of casing will affect the deformation distribution of pipeline, and it is necessary to optimize the design and protect it in practical engineering to avoid buckling caused by deformation concentration.