Experimental study on bed pressure around geotextile mattress with sloping plate

Xie, Liquan; Zhu, Yehui; Li, Yanhong; Su, Tsung-Chow

doi:10.1371/journal.pone.0211312

Cited by 6 publications

(6 citation statements)

References 24 publications

(24 reference statements)

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“…Both the GMFP studied in this structure and previously proposed structures [26,[30][31][32][33] are different novel scour control measures, and are appropriate for different situations. Compared with some of these structures, the GMFP requires less effort and cost in deployment and maintenance [29]. It should be noted that the GMFP is different from the geotextile mattress with sloping curtain studied in Xie et al [26,31].…”

Section: Introductionmentioning

confidence: 98%

“…In this paper, a Geotextile Mattress with Floating Plate (GMFP) is introduced for pipeline scour protection ( Figure 1). A GMFP is a novel device designed for scour and erosion protection proposed by [29]. It is composed of a geotextile mattress and a floating plate.…”

Section: Introductionmentioning

confidence: 99%

“…A series of empirical formulae were proposed to estimate the variation of the properties, including the sloping angles, the length of the bottom vortex, and the forces on the structure. Xie et al [29] improved the flexible protection structure presented by Xie et al [26], and proposed the GMFP. The seepage stability of the GMFP structure was analyzed in detail based on the experiment results and the potential risk of seepage failure in practical engineering was also discussed.…”

Section: Introductionmentioning

confidence: 99%

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Scour Protection Effects of a Geotextile Mattress with Floating Plate on a Pipeline

Zhu

Xie

2020

Sustainability

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Underwater pipelines are vital to the oil industry. Extending the service life of these pipelines is a key issue in improving the sustainability of oil transportation. A geotextile mattress with floating plate (GMFP) is a novel and sustainable countermeasure for scour and erosion control and is herein introduced to protect a partially buried pipeline from local scour in steady currents. A series of experiments was designed to verify the protection capabilities of the GMFP and investigate its parametric effects on protection. The average seepage hydraulic gradient under the pipeline was adopted to depict the protection effects of the GMFP, and was calculated with the pore pressure readings under the pipeline. The test results show that the GMFP is capable of protecting a pipeline from the onset of local scour in a unidirectional current. The average seepage hydraulic gradient below the pipeline decreases remarkably after a GMFP is installed. The average hydraulic gradient shows a descending trend with increased sloping angle α when 0.64 < sinα < 0.77. The hydraulic gradient hits a nadir at sinα = 0.77 and climbs with the increasing sloping angle when sinα > 0.82. The hydraulic gradient ascends when the bottom opening ratio δ increases from 0.167 to 0.231, due to the decreased intensity of the bottom vortex. The hydraulic gradient drops with a rising plate height, except for a fluctuation at Hp = 0.12 m. An approximate negative correlation is found between the obstruction height of the floating plate and the average hydraulic gradient under the pipeline. This could be partially attributed to the extension and amplification of the bottom vortex on the leeside of the pipeline due to the increased plate obstruction height.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Scour Protection Effects of a Geotextile Mattress with Floating Plate on a Pipeline

Zhu

Xie

2020

Sustainability

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“…Ground improvement methods by using geosynthetics have been developed extensively over the last few decades, particularly in the applications of pavement and foundation engineering. Although many experimental studies were undertaken to determine the effect of geosynthetic reinforcement, the analysis differs in regards to the properties of the geotextile such as shapes and sizes, spacing and thickness [1][2][3][4][5][6][7][8][9][10][11][12][13]. On top of that, the studies also analyse the influence of different types of soils and footing designs.…”

Section: Introductionmentioning

confidence: 99%

Effectiveness of strip footing with geogrid reinforcement for different types of soils in Mosul, Iraq

et al. 2020

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The main cause of problematic soil failure under a certain load is due to low bearing capacity and excessive settlement. With a growing interest in employing shallow foundation to support heavy structures, it is important to study the soil improvement techniques. The technique of using geosynthetic reinforcement is commonly applied over the last few decades. This paper aims to determine the effect of using geogrid Tensar BX1500 on the bearing capacity and settlement of strip footing for different types of soils, namely Al-Hamedat, Ba’shiqah, and Al-Rashidia in Mosul, Iraq. The analysis of reinforced and unreinforced soil foundations was conducted numerically and analytically. A series of conditions were tested by varying the number (N) and the width (b) of the geogrid layers. The results showed that the geogrid could improve the footing’s bearing capacity and reduce settlement. The soil of the Al-Rashidia site was sandy and indicated better improvement than the other two sites’ soils (clayey soils). The optimum geogrid width (b) was five times the footing width (B), while no optimum geogrid number (N) was obtained. Finally, the numerical results of the ultimate bearing capacity were compared with the analytical results, and the comparison showed good agreement between both the analyses and the optimum range published in the literature. The significant findings reveal that the geogrid reinforcement may induce improvement to the soil foundation, however, not directly subject to the width and number of the geogrid alone. The varying soil properties and footing size also contribute to both BCR and SRR values supported by the improvement factor calculations. Hence, the output complemented the benefit of applying reinforced soil foundations effectively.

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“…If properly designed, the local scour near the flexible structures is less significant compared with that of rigid structures. Such structures include inflatable flexible membrane dams [22], mattress curtain sets [23], fiber reinforced mats [24], suspended curtains [25], geotextile mattress with sloping curtain [26,27], geotextile mattress with sloping plate [28], etc.…”

Section: Introductionmentioning

confidence: 99%

Local Scour Near Flexible Flow Deflectors

Xie

Zhu

Huang

et al. 2020

Water

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Rigid flow deflectors are usually used on water flow beds to protect engineering structures such as breakwater in coasts and to regulate flow routes in open channels. To reduce its side-effects, i.e., local scour at the toe of deflectors, a flexible flow deflector is proposed, and the corresponding local scour was investigated in this study. A flume experiment was conducted to investigate local scour. To show the advantage of flexible deflectors, a control experimental test was also conducted using a traditional rigid deflector under the same blockage area configuration and the same flow conditions. The flow field near the flexible deflector was also measured to reveal the local flow field. The results show that the bed-scour develops near the toe edges of both flexible and rigid deflectors, but the maximum and averaged scour depths for the flexible deflector are smaller. This advantage of flexible deflector in scour depth is mainly caused by its prone posture, which induces the upward stretching and enlarging horizontally rotating vortex and the upward shifted vertically rotating vortex. The former dissipates more turbulent energy and the latter results in smaller bed shear stress, which lead to smaller scour depth directly. In addition, the up- and down-swaying movement of the flexible deflector can also assistant to dissipate more turbulent energy, thereby damping the intense of the horseshoe vortices and thus weakening scour depth as well. The results of this study provide an elementary understanding on the mechanisms of a flexible flow structure and an alternative deflector-device to reduce scour depth.

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Experimental study on bed pressure around geotextile mattress with sloping plate

Cited by 6 publications

References 24 publications

Scour Protection Effects of a Geotextile Mattress with Floating Plate on a Pipeline

Scour Protection Effects of a Geotextile Mattress with Floating Plate on a Pipeline

Effectiveness of strip footing with geogrid reinforcement for different types of soils in Mosul, Iraq

Local Scour Near Flexible Flow Deflectors

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