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Improvement of mechanical behavior of buried pipelines subjected to strike-slip faulting using textured

Mahdi IZADI, Khosrow BARGI

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 5,   Pages 1105-1119 doi: 10.1007/s11709-019-0539-1

Abstract: The present study investigates the mechanical behavior of a new generation of buried pipelines, dubbedIn conventional cylindrical pipelines, the axial and bending stresses brought about in their walls asThe present study has assessed 3-D numerical models of two kinds of buried textured pipelines, with 6and 12 peripheral triangular facets, subjected to a strike-slip faulting normal to the axis of the pipelineswhich aim at replacing the conventional cylindrical pipelines with textured ones in areas subjected

Keywords： buried pipeline     textured pipeline     local buckling    

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Prediction of vertical displacement for a buried pipeline subjected to normal fault using a hybrid FEM-ANN

Frontiers of Structural and Civil Engineering 2024, Volume 18, Issue 3,   Pages 428-443 doi: 10.1007/s11709-024-1015-0

Abstract: Fault movement during earthquakes is a geotechnical phenomenon threatening buried pipelines and withIn this study, the complex behavior of soil and a buried pipeline system subjected to a normal faultformula is 2.03%, which makes the proposed technique efficiently predict the vertical displacement of buriedpipelines and hence, helps to optimize the upcoming pipeline projects.

Keywords： buried pipelines     normal Fault     finite element method     multilayer perceptron neural network     formulation    

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Investigating peak stresses in fitting and repair patches of buried polyethylene gas pipes

Reza KHADEMI ZAHEDI, Pouyan ALIMOURI, Hooman KHADEMI ZAHEDI, Mohammad SHISHESAZ

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 1,   Pages 147-168 doi: 10.1007/s11709-019-0587-6

Abstract: Nowadays, polyethylene composes a large number of natural gas distribution pipelines installed underpolyethylene fittings in joining polyethylene gas pipes which are electrofused onto the pipe ends and buriedobjective is to study the effectiveness of polyethylene repair patches which are used to mend the defected pipelinesBuried polyethylene pipelines in the natural gas industry, can be imposed by sever loadings includingAlthough the buried pipe is imposed to the maximum values of stresses, the PE100 socket is more sensitive

Keywords： Ansys software     polyethylene     buried pipelines     polyethylene joints     polyethylene patches     peak von Mises    

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Transient Heat Transfer Problems for Buried Hot Waxy Crude Pipelines

Cui Xiuguo,Zhang Jinjun

Strategic Study of CAE 2003, Volume 5, Issue 7,   Pages 77-83

Abstract: Some complex transient heat transfer problems are accompanied with hot oil pipelines.The state-of-the-art and recent advances in transient heat transfer research for buried hot waxy crudepipelines are summarized from the two aspects of the internal heat transfer from the oil to the pipeThe factors governing the heat transfer of buried pipelines are discussed, and various methods involvedProblems needed to be further studied in transient heat transfer for buried hot waxy crude pipelines

Keywords： paraffin-base crude     pipeline transportation     transient heat transfer    

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Safety assessment for buried drainage box culvert under influence of underground connected aisle blasting

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 2,   Pages 191-204 doi: 10.1007/s11709-022-0906-1

Abstract: The vibration response evolution law of the buried drainage box culvert under blasting vibration wasof the box culvert, and PPV of the surface, it is proposed that the surface control velocity of the buried

Keywords： drainage box culvert     underpass blasting     dynamic response     numerical simulation     safety assessment    

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Construction of shallow buried large-span metro stations using the small pipe roof-beam method

Frontiers of Structural and Civil Engineering 2024, Volume 18, Issue 1,   Pages 122-136 doi: 10.1007/s11709-024-1008-z

Abstract: In relation to the Shifu Road Station project on Line 4 of the Shenyang Metro in China, a small-pipe roof-beam method for constructing subway stations is presented. First, a numerical simulation was performed to optimize the supporting parameters of the proposed method and determine the design scheme. Subsequently, the deformation of the pipe roof and surface settlement during the construction process were investigated. Finally, the surface settlement attributed to the excavation was studied through field monitoring, and the proposed method was compared with other methods. The results show that an increase in the pipe-roof spacing has little effect on the surface settlement and pipe-roof deformation. The bearing capacity of the pipe roof can be efficiently utilized once the flexural stiffness reaches 2EI, and the flexural stiffness is not the dominant factor controlling the deformation. The essential stages in controlling surface settlement are the excavations of the transverse pilot tunnels and the soil between them. The final settlement value of the ground was 24.1 mm, resulting in a reduction in the construction period by at least five months while satisfying the control requirements.

Keywords： subway station     pipe-roof method     surface settlement     simulation     on-site monitoring    

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Experimental and analytical investigation on friction resistance force between buried coated pressurized

Frontiers of Structural and Civil Engineering 2024, Volume 18, Issue 4,   Pages 615-629 doi: 10.1007/s11709-024-1017-y

Abstract: approach for estimating frictional resistance to pipe movement at soil and external pipe surface of buriedCM coated pipe buried in all three types of soil produced significantly higher frictional resistance

Keywords： friction resistance force     thrust force     coated pressurized steel pipe     soil type     overburden depth    

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Piezoelectric inertial robot for operating in small pipelines based on stick-slip mechanism: modeling

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 3, doi: 10.1007/s11465-022-0697-z

Abstract: Small pipes exist in industrial and biomedical fields, and require microrobots with high operational precision and large load capacity to inspect or perform functional tasks. A piezoelectric inertial pipeline robot using a “stick-slip” mechanism was proposed to address this requirement. In this study, the driving principle of the proposed robot was analyzed, and the strategy of the design scheme was presented. A dynamics model of the stick-slip system was established by combining the dynamics model of the driving foot system and the LuGre friction model, and the simulation analysis of the effect of system parameters on the operating trajectory was performed. An experimental system was established to examine the output characteristics of the proposed robot. Experimental results show that the proposed pipeline robot with inertial stick-slip mechanism has a great load capacity of carrying 4.6 times (70 g) its own mass and high positioning accuracy. The speed of the pipeline robot can reach up to 3.5 mm/s (3 mm/s) in the forward (backward) direction, with a minimum step distance of 4 μm. Its potential application for fine operation in the pipe is exhibited by a demonstration of contactless transport.

Keywords： pipeline robot     piezoelectric     inertial drive     stick-slip     large load capacity     dynamics model     small pipeline    

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Research on Development Strategies for the Remanufacturing of China’s Oil and Gas Pipelines

The Research Group for the Research on China’s Development Strategy for Oil and Gas Pipeline Remanufacturing

Strategic Study of CAE 2017, Volume 19, Issue 3,   Pages 66-71 doi: 10.15302/J-SSCAE-2017.03.010

Abstract: they are an important means of prospecting, exploiting, and transporting oil and gas, many oil and gas pipelinesPipelines are piling up in oilfields,resulting in an enormous waste of resources, as well as environmentalThis paper analyzes the treatment status and existing problems of oil and gas pipelines waste.remanufacturing technology, it demonstrates the economic, social, and environmental benefits of remanufacturing pipelinesaddition, this paper suggests an industrial mode for the remanufacturing of China's oil and gas pipelines

Keywords： oil     gas     pipelines     remanufacturing    

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Field measurement and analysis of asymmetric shallow buried twin tunnels with ultra small spacing

Wang Yunlong,Tan Zhongsheng,Chen Ying

Strategic Study of CAE 2012, Volume 14, Issue 11,   Pages 24-28

Abstract:

The ultra-small spacing tunnel of Jiaozhou Bay seabed tunnel in Qingdao is took for example; the surrounding rock pressure features and support force are analyzed through the field measurement. Results show that the surrounding rock pressure and support force of the after-excavation tunnel are larger than others of the tunnel. This result is different from the theoretical predictions and experimental results of most of the small spacing symmetry tunnel. To alleviate these problems effectively, support parameters are adjusted opportunely; the radial support capacity of the after-excavation tunnel is enhanced, and reinforcement measures of rock pillar are made at the same time. The monitoring results show that the stability of the after-construction tunnel has been effectively controlled, which provides useful reference for the design and construction of similar tunnels with small spacing.

Keywords： tunnel     ultra-small spacing     asymmetric     shallow-buried     field measurement    

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Determining the optimum economic insulation thickness of double pipes buried in the soil for district

Fating LI, Pengfei JIE, Zhou FANG, Zhimei WEN

Frontiers in Energy 2021, Volume 15, Issue 1,   Pages 170-185 doi: 10.1007/s11708-020-0680-5

Abstract: The insulation thickness (IT) of double pipes buried in the soil (DPBIS) for district heating (DH) systemsThree types of heat sources, four operating strategies, three kinds of insulation materials, three buried

Keywords： double pipes     optimization model     optimum insulation thickness     minimum annual total cost    

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Thermal analysis of the new technology of crude oil pipeline and products pipeline laid in one ditch

Ling Xiao,Wang Yi,Yu Bo,Zhang Jinjun,Da Xin,Zhang Zhengwei

Strategic Study of CAE 2008, Volume 10, Issue 11,   Pages 30-36

Abstract:

An unstructured-finite-volume method is used for investigating the new technology of crude oil pipeline and products pipeline laid in one ditch. The new technology is simulated. The thermal impact of the products pipeline on the hot crude oil pipeline, especially on the crude oil temperature is studied with the varying pipeline intervals.

Keywords： oil pipelines     double pipelines laid in one ditch     thermal analysis     numerical simulation     pipeline interval    

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Modal analysis of acoustic leak signal in pipelines using time-frequency analysis

JIAO Jing-pin, FEI Ren-yuan, HE Cun-fu, WU Bin

Frontiers of Mechanical Engineering 2006, Volume 1, Issue 2,   Pages 146-150 doi: 10.1007/s11465-006-0013-3

Abstract: is important to analyze the propagation characteristics of guided waves in acoustic leak location in pipelines

Keywords： dispersion     selection     guided     research     time-frequency    

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The damage effect of earth penetrating weapons and key scientific problems of deep buried protective

Fan Pengxian,Qian Qihu,Wang Mingyang

Strategic Study of CAE 2013, Volume 15, Issue 5,   Pages 47-58

Abstract:

The protective engineering is an important constituent part of the deterrent force of national defense, and of great strategic position. The earth penetrating weapons (nuclear and non-nuclear) developing by countries with military power have already posed a great threat to the safety of our protective engineering. On the summary of the developing earth penetrating weapons, the damage effects of earth penetrating weapons are reviewed, with emphasis on penetrating effect, crater effect and explosion ground shock effect. Aiming at the main threatens, the major measures and technological approaches are discussed. And several key scientific problems, including comprehensive protection system, nonlinear deep rock mass mechanics, pendulum type wave and ultra-low friction phenomenon, and gather effect of several n-bombs, are proposed, which are with urgent need to be researched.

Keywords： earth penetrating weapons     damage effect     deep buried     protective engineering    

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Study on support mechanical behaviour and scheme for shallow buried tunnel in weak wall rock with rich

Wan Fei,Tan Zhongsheng,Yang Sensen,Ma Dong

Strategic Study of CAE 2014, Volume 16, Issue 8,   Pages 45-53

Abstract:

Shallow buried section under river valley of Guan Jiao tunnel has doneThese research results can provide theoretical basis and underlying date for support scheme for Shallow buried

Keywords： Tunnel project     Shallow buried under river valley     Weak wall rock     Support scheme     Field monitoring    

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Title Author Date Type Operation

Improvement of mechanical behavior of buried pipelines subjected to strike-slip faulting using textured

Mahdi IZADI, Khosrow BARGI

Journal Article

Prediction of vertical displacement for a buried pipeline subjected to normal fault using a hybrid FEM-ANN

Journal Article

Investigating peak stresses in fitting and repair patches of buried polyethylene gas pipes

Reza KHADEMI ZAHEDI, Pouyan ALIMOURI, Hooman KHADEMI ZAHEDI, Mohammad SHISHESAZ

Journal Article

Transient Heat Transfer Problems for Buried Hot Waxy Crude Pipelines

Cui Xiuguo,Zhang Jinjun

Journal Article

Safety assessment for buried drainage box culvert under influence of underground connected aisle blasting

Journal Article

Construction of shallow buried large-span metro stations using the small pipe roof-beam method

Journal Article

Experimental and analytical investigation on friction resistance force between buried coated pressurized

Journal Article

Piezoelectric inertial robot for operating in small pipelines based on stick-slip mechanism: modeling

Journal Article

Research on Development Strategies for the Remanufacturing of China’s Oil and Gas Pipelines

The Research Group for the Research on China’s Development Strategy for Oil and Gas Pipeline Remanufacturing

Journal Article

Field measurement and analysis of asymmetric shallow buried twin tunnels with ultra small spacing

Wang Yunlong,Tan Zhongsheng,Chen Ying

Journal Article

Determining the optimum economic insulation thickness of double pipes buried in the soil for district

Fating LI, Pengfei JIE, Zhou FANG, Zhimei WEN

Journal Article

Thermal analysis of the new technology of crude oil pipeline and products pipeline laid in one ditch

Ling Xiao,Wang Yi,Yu Bo,Zhang Jinjun,Da Xin,Zhang Zhengwei

Journal Article

Modal analysis of acoustic leak signal in pipelines using time-frequency analysis

JIAO Jing-pin, FEI Ren-yuan, HE Cun-fu, WU Bin

Journal Article

The damage effect of earth penetrating weapons and key scientific problems of deep buried protective

Fan Pengxian,Qian Qihu,Wang Mingyang

Journal Article

Study on support mechanical behaviour and scheme for shallow buried tunnel in weak wall rock with rich

Wan Fei,Tan Zhongsheng,Yang Sensen,Ma Dong

Journal Article