Experimental Study of Pressure and Soil Effects on Fluidization and Mobile Bed Zones around Buried Leaking Pipes

Latifi, Milad; Mohammadbeigi, Shima; Moghadam, Kambiz Farahi; Naeeni, Seyed Taghi Omid; Kilanehei, Fouad

doi:10.1061/(asce)ps.1949-1204.0000671

Cited by 6 publications

(2 citation statements)

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“…When inter-particle forces reduce and particles are free to move with the pore fluid (i.e., the particles become separated and in motion), fluidisation of a granular material occurs (Figure 1). In an upward flow, the area where the water and soil particles flow upward and finally rotate is called the fluidised zone, and the surrounding zone, where the water and particles flow downward, is called the mobile bed zone [17].…”

Section: Fluidisationmentioning

confidence: 99%

“…The failure rate was primarily influenced by the direction of the leakage jet, followed by the leakage flow, size of the sand particles, pipe material, and coating depth. Latifi et al [17] conducted an experiment using a box containing a uPVC pipe with a longitudinal crack on the crown. The pipe was buried under various types of soil, and water was then pushed through it.…”

Section: Fluidisationmentioning

confidence: 99%

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Experimental Investigation of Leakage Flow Rate and Fluidisation beneath Polyethylene Pipes in Non-Uniform Soils

Sharafodin,

Latifi,

Ghodsian

2024

Water

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Soil fluidisation around buried pipes is one of the water leakage effects that has a direct influence on the ultimate failure of pipelines. In this research, using a laboratory model, the fluidisation caused by water leakage from three cracks with three lengths (14, 17, and 20 mm) and a 3 mm diameter hole for five pressures (1.5–5.5 bar) in non-uniform soils has been evaluated. The experiments were carried out both for pipes buried in soil, as well as exposed pipes. In the buried pipe tests, leakage flow rate, fluidisation, and mobile bed zone dimensions were investigated. The results showed that the increase in leakage flow rate due to an increase in pressure and crack length in exposed pipes is higher than in buried pipes. The exponent of the leakage–pressure relationship was obtained between 0.40 and 0.47 for the hole and between 0.8 and 1.9 in the crack. Observing different development patterns for fluidisation and mobile bed zones in cracks and holes, new relationships are presented for the height, width, and cross-sectional area of the leakage zones.

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Section: Fluidisationmentioning

confidence: 99%

Section: Fluidisationmentioning

confidence: 99%