Structural Behavior of Pipelines Buried in Expansive Soils under Rainfall Infiltration (Part I: Transverse Behavior)

Bouatia, Mohammed; Demagh, Rafik; Derriche, Zohra

doi:10.28991/cej-2020-03091585

Cited by 17 publications

(6 citation statements)

References 38 publications

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“…The burial depth of the pipe is assumed to be 2 m. Following many published investigations, the horizontal and vertical dimensions of the model are set as follows: Vertical= 5*D, Horizontal= 10*D, where D is the diameter of the pipe, in order to avoid the boundary condition effects (Vazouras et al, 2015;Bouatia et al, 2020). For the soil mass, meshing is automatically generated where quadrilateral and triangular planestrain elements are created, forming thereby a unified mesh size of 0.25 m. The pipe was modeled as a beam structural element, where the perimeter is divided into 24 equal segments.…”

Section: Numerical Model Geomtrymentioning

confidence: 99%

Numerical Investigation on Buried Pipelines Subjected to Permanent Ground Deformations Due to Shallow Slope Failure

Bouatia¹,

Demagh²,

Derriche³

2023

JJCE

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Permanent ground deformations (PGDs) induced by slope failures cause catastrophic damage to buried pipelines. This paper presents a 2D plane-strain numerical analysis of the behavior of a 800 mm water transport pipeline buried in the Aine-Tine slope (Mila, Algeria) subjected to shallow PGD, as it could be triggered by the recent earthquake of August 07th, 2020 (M= 4.9). The analysis is carried out through the application of an incremental displacement to simulate the soil-pipeline interaction while focusing on the effect of (1) the magnitude of the PGD and (2) the rigidity of the pipeline on the structural response of the pipeline. The elasticperfectly Mohr-Coulomb model was used to simulate the soil behavior and the elastic model was used to simulate that of the steel pipe. Pipeline deformations (i.e., translation and ovalization) and radial internal forces’ (i.e., axial forces F୅, shear forces Fୗ and bending moments M୆) results highlighted that shallow PGD can exert additional loads on pipelines that are proportional to the magnitude of the PGD. It has been found that the soil deformations as well as the internal forces induced on the pipeline ring are higher for rigid pipelines. Moreover, the results indicated that rigid pipelines are more effective than flexible ones as far as ovalization-serviceability limit state is concerned. In effect, for PGD magnitudes of 0.5, 1 and 2 m, the ovalization values of the flexible pipeline are, respectively, higher by 23%, 21% and 18% than those calculated for the rigid pipeline. Through a simplified linear numerical simulation such as that presented in this study, engineers and planners could be guided to foresee the possible causes of pipeline leaks and the mechanisms of ruptures that lead very often to severe disruption of pipelines’ normal operation. KEYWORDS: Soil-structure interaction, Slope failure, Permanent ground deformation, Pipelines, Radial internal forces, Ovalization

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Section: Numerical Model Geomtrymentioning

confidence: 99%

Numerical Investigation on Buried Pipelines Subjected to Permanent Ground Deformations Due to Shallow Slope Failure

Bouatia¹,

Demagh²,

Derriche³

2023

JJCE

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“…One of the most important achievements of this method is the optimization of the initial designing cost. is method is based on possible changes of the loads and material properties [15]. e limit state method considers uncertainties related to the loads and material properties; therefore, it uses relative safety factors to gain loads and stresses of the design [16].…”

Section: Designing a Marine Pipelinementioning

confidence: 99%

Free Span Analysis for Submarine Pipelines

Pour

Taheri

abyaneh

2021

Shock and Vibration

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Pipelines are one of the most important and key elements that align with transferring hydrocarbon products in coastal and offshore industries which are exposed at various risks during their servicing. In this project, we are studding and describing free spanning of marine pipeline based on DNVGL-RP-F-105 regulation applying the finite element method by Abaqus software. For modeling, case studies of Gorze to Kish oil pipeline have been used. In order to provide and study the integrity of the structure against fatigue, the exact place as well as the free span length using software under environmental loading based on DNVGL-RP-F205 has been determined. Since based on DNVGL-TS-F101 free span causes local buckling, fatigue, and pipe burst then given to the servicing as well as environmental conditions, pipe condition has been monitored. Finally, using sensitivity analysis, the effect of different soil classes, elasticity module, and temperature on the pipe condition has been studied. At the end, the question if it is allowed to use a cross model for bed has been answered in previous studies.

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“…The structural engineers face many challenges to design and build the budget-consuming projects with safety and durability. The heavy loads may damage the piping structures or disturb their normal operation whenever their magnitudes reach the threshold limit of the mechanical strength [1,2]. Predominantly, the structural engineers perform three-dimensional (3D) finite element analyses to investigate the behavior of the buried pipe that are exposed to strikeslip fault movement in dry and partially saturated sand [2].…”

Section: Introductionmentioning

confidence: 99%

Analytical and Numerical Model of Aluminum Alloy Swaging Ring Design to Study the Effect on the Sealing for Piping Systems

Atak

2021

Civ Eng J

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In various fields of engineering, the assembly and repair of hydraulic installations are accomplished by joining the pipes. In such applications, the ring swaging method is used to connect the fittings to the pipes by means of a hydraulic hand tool. The basis to develop a swaging tool relies on the knowledge of the design parameter that influence plastic deformation of the swaging ring. In addition to build control over the design parameters, it is necessary to join pipes under severe conditions such as cryogenic vacuum and constrained space which require an intact sealing. In this study, the effect of swaging ring designs on sealing and strength has been examined and different swaging methods have been investigated by finite element modeling methods. Based on the obtained results, the analysis methodology of ring swaging and the characteristic impact of swaging ring design on the sealing of pipe connection are shown. The prime novelty of the study is to report the impact of swaging ring design and geometry on sealing efficiency of the pipe connection. The results of the study open new avenues for the development of efficient tools for designing swaging rings. Doi: 10.28991/cej-2021-03091641 Full Text: PDF

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Structural Behavior of Pipelines Buried in Expansive Soils under Rainfall Infiltration (Part I: Transverse Behavior)

Cited by 17 publications

References 38 publications

Numerical Investigation on Buried Pipelines Subjected to Permanent Ground Deformations Due to Shallow Slope Failure

Numerical Investigation on Buried Pipelines Subjected to Permanent Ground Deformations Due to Shallow Slope Failure

Free Span Analysis for Submarine Pipelines

Analytical and Numerical Model of Aluminum Alloy Swaging Ring Design to Study the Effect on the Sealing for Piping Systems

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