RESEARCH ARTICLE


Stress Analysis of Suspended Pipe Partially Buried in Linear Elastic Soil



Kun Huang, Xia Li*, Yiheng Zhang
School of Petroleum and Gas Engineering, Southwest Petroleum University, Chengdu, China


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© Huang et al; Licensee Bentham Open.

open-access license: This is an open access article licensed under the terms of the Creative Commons Attribution-Non-Commercial 4.0 International Public License (CC BY-NC 4.0) (https://creativecommons.org/licenses/by-nc/4.0/legalcode), which permits unrestricted, non-commercial use, distribution and reproduction in any medium, provided the work is properly cited.

* Address correspondence to this author at the School of Petroleum and Gas Engineering, Southwest Petroleum University, Chengdu, China; Tel: +86-135-5126-3619; E-mai: lixia_swpu@126.com


Abstract

Based on the small deflection beam theory, bending equation with axial tension of suspended pipe partially buried in the linear elastic soil is established. And the corresponding boundary conditions are given according to the stress and deformation characteristics of suspended section and buried section. Then deflection equation for the suspended section is deduced. Afterwards, the stress and critical length of a suspended pipeline are calculated and analyzed. The results show that the tensile stress and bending stress on the endpoint of the suspended section meet the requirement of first strength theory and the critical suspended length is greater than the real suspended length, which is consistent with the actual situation. When the stiffness of soil tends to approach infinity, both the limit value of axial tension and endpoint bending moment agree well with the calculation results of fixed-fixed supported beam model.

Keywords: Axial tension, linear elastic soil, small deflection theory, suspended pipe.