Combined influence of seasonal processes of permafrost soils on stress and strain state of underground oil pipeline

• Published in: IOP Conference Series: Materials Science and Engineering
• Main Authors: Naumov, O V, Moskvitin, G V
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: IOP Publishing 2020
• Subjects: permafrost
• Online Access: http://dx.doi.org/10.1088/1757-899x/747/1/012026; https://iopscience.iop.org/article/10.1088/1757-899X/747/1/012026/pdf; https://iopscience.iop.org/article/10.1088/1757-899X/747/1/012026

Abstract The paper simulates the condition of the underground oil trunk pipeline under the combined influence of freezing-thawing processes in permafrost soils. Changes in seasonal temperatures lead to the emergence of processes such as heaving and sinkholes, which affect the spatial position and performance of the pipeline. The paper presents the calculation of the underground pipeline laying in permafrost with an outer diameter of 520 mm (steel 355 JR), a length of 30 m (depth of 1.5 m), which passes oil temperature 25 °C under pressure of 5 MPa, with the temperature of the outer shell of the pipe 0 °C. Simulation was carried out in SolidWorks using the Simulation package. The stress-strain state and displacements arising from the combined effects of processes in permafrost soils are determined. According to the results of the study, conclusions are drawn about the impact of the combined effects of freezing and thawing processes on the performance of the underground pipeline.