Dynamic response model and equivalent solution method of large-diameter buried energy transportation pipeline under moving load

https://doi.org/10.1016/j.jngse.2022.104724Get rights and content

Highlights

  • A dynamic response model for a buried pipeline was established.

  • The change of three-dimensional stress state of the pipeline was analyzed.

  • The model of plastic zone in response to the change of ground load was established.

  • The accuracy of model fitting and the cost of simulation calculation were evaluated.

Abstract

Long-distance energy pipeline pass under roads, subjecting them to repeated stress and posing pipeline safety problems. To simulate the effects of vehicles driving over energy transmission pipeline, this paper examines large-caliber buried pipelines in the suburbs. In this study, a mechanical action model of vehicle-soil-pipeline (VSP) interactions to transform the process of a vehicle driving into the dynamic process of a load changing with time in the specified area was created. The VSP model was used to analyze the influence of moving load and position on the structural characteristics of the pipeline section. An equivalent solution method with high precision and high calculation efficiency was proposed. The results showed that as the loading position approaches the pipeline or the load increases, the stress value at the top of the pipeline gradually exceeded the stress value at the bottom of the pipeline and became the area with the maximum stress value. The minimum stress location also changed from the lower half near the pipeline bottom (Point D-135°) to the upper half near the pipeline top (Point B-45°or Point H-315°). Using the polynomial fitting method, the stress values of the maximum points were equivalently converted. Under the premise of considering pipeline safety, the most suitable functional relationship for the moving load equivalent model was obtained.

Section snippets

Credit author statement

Qian (First name) Xu (Family name), Liqiong (First name) Zhong (Family name): Methodology, Software, Writing-Original draft preparation. Mengjie (First name) Shu (Family name), Zhenwei (First name) Zou (Family name): Conceptualization, Supervision, Writing-Review & Editing. Gang (First name) Yang (Family name), Qiang (First name) Zheng (Family name): Visualization, Investigation, Writing-Review & Editing. Xingli (First name) Chen (Family name), Nevzat (First name) AKKURT (Family name): Data

Mathematical description of VSP mechanical action model

The calculation process of pipeline deformation under vehicle load consists of three parts. The first is the calculation of vehicle load, which involves the action area and influence range of the load. The second is the calculation of pipeline-soil interaction, which derives the earth pressure around the pipeline through the basic equations of structural mechanics. The third is to use the Iowa formula (Spangler and Shafer, 1938) to solve the deformation of the flexible pipeline.

Numerical simulation solution of VSP

To solve pipeline deformation under vehicle load, it is necessary to determine the vehicle load action form; the physics, geometry, balance equations of the pipe-soil interaction; and the corresponding boundary conditions. Only after these are determined can pipeline deformation theory be applied. Regarding deformation as a two-dimensional problem, there are 12 equations from Eqs. (7)–(18). Next, the vehicle load stress boundary conditions, pipe soil displacement constraint boundary conditions,

Results and analysis

The VSP model described above was used to simulate the central section of the pipeline under load (z = 0 m) from different vehicle loads and positions. Combined with the pipeline stress distribution and numerical calculation results, the process of vehicle driving was converted into a process of dynamic loading in the central location.

Conclusion

This paper described the mechanics of the VSP and proposed a VSP simulation calculation model to analyze the stress field of the large-diameter energy transportation pipeline under the load of the vehicle. The solution was derived by the FEM, and the corresponding equivalent loading method of moving load was proposed.

  • (1)

    When the vehicle load increased, the pipeline top shown a linear increase, reached 58.6 MPa at 0.35 MPa, which was 3.08 MPa larger than the bottom stress value of the pipeline with

Declaration of competing interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Acknowledgments

The authors gratefully acknowledge the National Environmental and Energy Base for International Science & Technology Cooperation. And this work is supported by the Fundamental Research Funds for the National Natural Science Foundation of China (No.52006008, 62033014, 11801029), Basic and Applied Basic Research Fund of Guangdong (2019A1515110743), and the Central Universities of China (FRF-TP-18-074A1, FRF-BD-20-09 A, FRF-BD-20-02 A), and the Youth Teacher International Exchange & Growth Program

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