Papers by Keyword: Buried Pipeline

Abstract: Natural gas is selected as transition energy to achieve net zero emissions. Gas pipeline construction is developed in accordance with Sustainable Development Goals on Industry, Innovation & Infrastructure, Clean & Affordable Energy, and Climate Action. The potential risk of the heat transfer process from the pipeline to the ground surface temperature can create a potential hazard that can cause pain/injury to human skin if it exceeds the pain threshold temperature. This study aims to investigate the best method for risk mitigation of heat transfer from gas pipelines to the ground surface, through alternative solutions such as burial deepening options, insulation options, or air cooler at well site options. These options are studied as part of the risk mitigation strategy for the buried high-temperature gas pipeline construction. These risk mitigation options consider technical and economic feasibility studies at the conceptual stage presented in this study to identify the best option to mitigate the potential injury risk to humans. The result with a buried insulated pipeline is the best option for controlling heat transfer compared to the air cooler option. The constructability of burial deepening up to 8 m is not feasible, especially the 6m depth of the groundwater table observed.

Abstract: UHVDC transmission could deliver high-power electricity over long distances effectively, while the DC stray current led to corrosion of grounding device and the surrounding buried metal during the operation inevitably. This paper reviewed the research progress of HVDC corrosion at home and abroad in recent years. It elaborated corrosion research direction of HVDC system from three aspects, which were pole, grounding grid and the neighboring tower grounding body buried pipeline respectively. Describing the anti-corrosion measures on grounding devices and buried pipeline, and explaining the advantages and defects of various anti-corrosion technology. At last, we proposed that it was necessary to expand the research in UHVDC field, grasp the erosion rule of DC stray current in soil comprehensively to enhance the security of UHVDC transmission system of national grid.

Abstract: The liquefaction failure forms are reviewed, including foundation strength failure, sand boil, seismic settlement, large ground displacement and flow slide. Taking pile foundations and buried pipeline as examples, there suggested some measures to reduce hazards of liquefaction.

Abstract: On the basis of Virtual Work, in this paper, the formulae are deduced for the floatation response of buried pipeline duo to the soil liquefaction. A beam model based on the theory of beam on elastic foundation is used for the pipeline buried in non-liquefied and liquefied area, considering the effects of nonlinear soil constraint and the initial deformation, the length of liquefied area, and the axial force acting on the pipeline. The study of floatation response of buried pipeline are conducted using the nonlinear increment element method, some results are given.

Abstract: Impact loads caused by punching pile construction of highway bridges are bound to disturb stratum surrounding the buried pipeline adjacent to, which would adversely affect the normal use and safe operation of buried pipelines. Through developing field micro-seismic trial, the characteristics of vibration attenuation and sphere of influence were analyzed, in order to assess its impact on buried pipeline nearby. It drew conclusions that the amplitude of vibration energy had been enlarged with the presence of the pipeline; It should conduct the surface peak velocity above the pipeline as the main control index in routine vibration monitoring of pile foundation construction adjacent to buried pipeline; by positioning analysis of impacting vibration source, the rupture area of rock and soil around the pipeline caused by the vibration was determined, and security measures for pipeline protection was proposed. It provides a new method of control technology for pile foundation construction.

Abstract: In this paper, the formulae are deduced for the floatation response of pipeline buried in liquefied soil. The beam model based on the theory of beam on elastic foundation is used for the pipeline buried in non-liquefied and liquefied soil. The soil property is nonlinear, the floating force induced by the soil liquefaction is related to the position of pipeline, is nonlinear also. For the convenience and simplification of analysis, the nonlinear increment element method was used and lots of numerical analysis was conducted, including: the floatation response of pipeline buried in homogeneous soil, the floatation response of pipeline buried in non-homogeneous soil, and the floatation response of pipeline buried in discontinuous liquefied area. The influential factors on the floatation response of buried pipeline buried in liquefied soil including spring stiff of liquefied soil, the initial deformation, the length of liquefied area, the axial force acting on the pipeline, the material of pipeline, and the diameter of pipeline. The calculation results of discontinuous liquefied area draw a significant conclusion that for a long liquefied area, to make the soil non-liquefied in the middle of liquefied area may decrease the length of liquefied area and reduce the flotation displacement of pipeline greatly.

Abstract: The finite element analysis of the underground buried pipes were done by being used ANSYS software. In order to improve or replace the traditional calculation method, basic information on buried pipeline without frusta was set up , stress and deformation were analyzed, a finite element calculation model was established.

Abstract: Combining with specific engineering project, the author has researched the impact image method that was applied on inverse analysis of foundation structure of the buried pipeline. The author has also expounded the theory, method, process and conclusion of the impact image method in the detection of the buried pipelines basis. The results show that, it is a nondestructive testing method with high reliability and accuracy. Using this method, people could make sure whether there are boulders, empty or loose areas. Thus scientific basis could be provided to dispose the defect beneath the buried pipeline.

Abstract: Buried pipelines are important lifeline engineering. During war conventional weapons blasting in the air would induce indirect ground shock, and the shock to the buried pipeline can lead to the paralyzed of urban economic and social function. And the numerical simulation of the dynamic damage of buried pipeline is complicated and time consuming, so this article using the equivalent static load method proposes analytic solution method of stress calculation of buried pipeline under ground shock. Through comparing the results calculated by analytic solution method and numerical solution, it shows that the analytical solution is feasible in engineering application.

Abstract: Because earthquakes may cause severe damage to buried pipelines, it is important to study dynamic response of buried pipelines. For dynamic response problem of buried pipelines, variational method is the suitable method. In the paper, Gurtin-type quasi-variational principle of buried pipelines dynamics is established by convolutional variational integral method, which is theoretical foundation of finite element method for solving buried pipelines dynamics problems.