Investigating the Effects of Local Contact Loss on the Earth Pressure Distribution on Rigid Pipes

Kamel, S.; Meguid, Mohamed A.

doi:10.1007/s10706-012-9580-8

Cited by 11 publications

(2 citation statements)

References 5 publications

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“…The boundaries of the steel tank were: 2.6 D (Dthe pipe diameter) from the surface level to the pipe crown, and 2.8 D from the base of the tank to the pipe invert, while the tank side was at 5.5 D from circumference of the pipe [18]. The tank has a hole in the front and rear side for the pipe to go through, and a rubber membrane put at both ends of the pipe (front and rear sides) to prevent sand leakage during loading.…”

Section: Loading Frame and Steel Tankmentioning

confidence: 99%

Protecting buried pipelines using different shapes of geofoam blocks

Hassan¹

2021

Min. miner. depos.

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Purpose. This research presents experimental modeling and numerical analysis on reducing stress and protecting buried pipelines using three arrangements techniques of expanded polystyrene (EPS) geofoam blocks: embankment, EPS block embracing the upper part of the pipe and EPS blocks as two posts and a beam. Methods. An experimental model consisted of steel tank with boundaries dimensions depending on the diameter of the pipe located at the center of it. The backfill on the pipe was made from sand and embedded EPS blocks with two techniques: EPS block embracing the upper part of the pipe and EPS blocks form two posts and a beam. Series of experiments were carried out using static loading on rigid steel plate to measure the pipe deformations and strains, as well as backfill surface displacement. The numerical analysis was used to simulate the experimental model using the finite element software program PLAXIS-3D. Findings. The results reveal that the most effective method which prevents stress on the buried flexible pipe was EPS post and beam system followed by EPS embracing the upper part of the pipe. The results obtained from the numerical analysis and the experiment demonstrate the same trend. The parametric study shows that EPS post and beam blocks model has higher surface displacement than embracing the upper part of the pipe model, which is more effective in case of high rigidity of the pipe. Originality. Reducing stress on buried pipes using different geofoam shapes to find which one is the optimum method. Practical implications. Two configurations of EPS geofoam blocks – EPS block embracing the upper part of the pipe and EPS blocks post and beam system - ensure successful stress reduction and protect buried pipes

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Section: Loading Frame and Steel Tankmentioning

confidence: 99%

Protecting buried pipelines using different shapes of geofoam blocks

Hassan¹

2021

Min. miner. depos.

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“…Pipeline erosion not only causes losses of soil and water but also disturbs the stress state of the strata [15], changing the forces acting on pipe structures. Under certain circumstances, this can lead to further pipe damage [16]. However, to the best of our knowledge, no recent studies have focused on the changes in the forces acting on pipe structures during leakage.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation on soil erosion under different pipeline-leaking locations

Wang,

Tan,

Long

2024

IOP Conf. Ser.: Earth Environ. Sci.

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In recent years, cave-in ground failures have become increasingly common worldwide. The leakage of defective pipelines buried below ground level has been identified as a significant contributor to these failures. This study utilized experimental seepage-erosion tests to characterize ground collapses resulting from pipeline leakage and examined the impacts of leakage locations on soil and water losses. Subsequently, discrete element method-finite difference method (DEM-FDM) coupling analyses were conducted to elucidate the mesoscopic mechanisms of pipeline leakage, including changes in seepage force, effective stress, and soil pressure on the pipeline during leakage. The findings include: (1) The locations of leaking spots on pipelines significantly influenced soil and water losses; (2) Leaking spots closer to the pipe bottom led to more severe ground collapses due to larger seepage forces; (3) Soil pressure exhibited decreasing trends near the leaking spot and increasing trends at other locations due to the soil arching effect. These insights provide valuable guidance for preventing pipeline leakages.

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Analysis of Stratigraphic Subsidence Caused by Sand Leakage in Tunnel Lining

Wang

et al. 2020

Geotech Geol Eng

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Investigating the Effects of Local Contact Loss on the Earth Pressure Distribution on Rigid Pipes

Cited by 11 publications

References 5 publications

Protecting buried pipelines using different shapes of geofoam blocks

Protecting buried pipelines using different shapes of geofoam blocks

Experimental and numerical investigation on soil erosion under different pipeline-leaking locations

Analysis of Stratigraphic Subsidence Caused by Sand Leakage in Tunnel Lining

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