Image1_Improved Analytical Method for Longitudinal Strain Analysis of Buried Pipelines Subjected to Thaw Slumping Load.jpg

• Main Authors: Beilei Ji (11369829), Xiaoben Liu (11369832), Dinaer Bolati (11369835), Yue Yang (52715), Jinxu Jiang (11369838), Yuqing Liu (103879), Hong Zhang (25820)
• Format: Still Image
• Language: unknown
• Published: 2021
• Subjects: Nuclear Engineering; Carbon Sequestration Science; Automotive Combustion and Fuel Engineering (incl. Alternative/Renewable Fuels); Carbon Capture Engineering (excl. Sequestration); Non-automotive Combustion and Fuel Engineering (incl. Alternative/Renewable Fuels); Chemical Engineering not elsewhere classified; Power and Energy Systems Engineering (excl. Renewable Power); Renewable Power and Energy Systems Engineering (excl. Solar Cells); Energy Generation; Conversion and Storage Engineering; Nuclear Engineering (incl. Fuel Enrichment and Waste Processing and Storage); Chemical Sciences not elsewhere classified; thawing landslide; buried pipelines; longitudinal strain; analytical method; critical slumping displacement; permafrost
• Online Access: https://doi.org/10.3389/fenrg.2021.742348.s001

Thawing landslide is a common geological disaster in permafrost regions, which seriously threatens the structural safety of oil and gas pipelines crossing permafrost regions. Most of the analytical methods have been used to calculate the longitudinal stress of buried pipelines. These analytical methods are subjected to slope-thaw slumping load, and the elastic characteristic of the soil in a nonlinear interaction behavior is ignored. Also, these methods have not considered the real boundary at both ends of the slope. This study set out to introduce an improved analytical method to accurately analyze the longitudinal strain characteristics of buried pipelines subjected to slope-thaw slumping load. In this regard, an iterative algorithm was based on an ideal elastoplastic model in the pipeline-soil interaction. Based on field monitoring and previous finite element results, the accuracy of the proposed method was validated. Besides, a parametric analysis was conducted to study the effects of wall thickness, internal pressure, ultimate soil resistance, and slope angle on the maximum longitudinal strain of the pipeline. The results from the compression section showed that the pipeline is more likely to yield, indicating an actual situation in engineering. Moreover, the maximum longitudinal tensile and compression strain of pipelines decrease with increasing the wall thickness, internal pressure, ultimate resistance of soil, and slope angle. Finally, based on the pipeline limit state equations in CSA Z662-2007 and CRES which considered the critical compression factor comprehensively, the critical slumping displacements for both tensile and compressive strain failures were derived for reference. The research results attach great significance to the safety of pipeline under slope.