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Establishment and analysis of the model of buried gas pipeline crossing the fault
Author of the article:Fan Feng, Feng Xiaohong
Author's Workplace:Shandong Natural Gas Pipeline Co.,Ltd. China University of Petroleum
Key Words:Crossing fault; buried gas pipeline; fault movement; nonlinear; finite element model
Abstract:Buried pipeline and the surrounding soil are taken out together from the semi infinite medium, and dissociated with SHELL281 element and SOLID45 element respectively. The pipeline is simulated as thin-walled hollow cylindrical structure and the soil is simulated as uniform entity medium. On the premise of ensuring the calculation accuracy, according to the actual condition, the pipeline-soil nonlinear contact model based on state nonlinear theory is established, which is used to simulated the slippage, separation and closure phenomenon between pipeline and soil. The interaction between the pipeline and the surrounding soil was analyzed by using the finite element method to determine the effective calculation area of the model. Different constitutive models of pipeline and soil are compared. An engineering project were calculated through different methods to prove the rationality and accuracy of the model built.
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