Scour effects on bearing capacity of composite bucket foundation for offshore wind turbines

Zhao, Xing; Zhang, Puyang; Lv, Yajun; Ding, Hongyan

doi:10.1080/1064119x.2019.1566841

Cited by 25 publications

(17 citation statements)

References 20 publications

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“…The fixed displacement ratio method can search the loading path of foundation in arbitrary load space, and can determine the envelope of bearing capacity of foundation in corresponding load space by multiple loading paths, which requires multiple calculations to obtain the loading path and finally to determine the envelope. However, this method has universal practicability for various loading modes and no requirement for symmetry [22]. The fixed displacement ratio method is used in this paper.…”

Section: Bearing Capacity Characteristics Of Cbf Under Different Loadsmentioning

confidence: 99%

“…The constitutive relationship and the failure mechanism of soil condition have some uncertainty. Most of the researches on suction foundations are based on the failure mode and the ultimate bearing capacity under vertical load [22], horizontal load, bending moment [23] and uplift load [24]. However, previous research has failed to consider the influence of the torque load.…”

Section: Introductionmentioning

confidence: 99%

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Bearing Capacity Characteristics of Composite Bucket Foundation Under Torque Loading

Zhang

et al. 2019

Energies

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The composite bucket foundation for offshore wind turbine bears the vertical load from not only the superstructure and the horizontal load, caused by wind and wave, but also from the torque load caused by rotating structures, such as blades. Based on layered soil foundation, the influence of the skirt height, the friction coefficient between soil and bucket foundation and the diameter of the bucket foundation on the stress of the bucket skirt under the torque load are studied in this paper. Moreover, the envelope curves of the bearing capacity of H–T and V–H–T are obtained by the fixed displacement ratio loading method. The bearing capacity characteristics of composite bucket foundation under different loading combinations are analyzed. The results show that: (1) The effect of inside soil on the bucket skirt is greater than that of the outside soil; (2) when composite loads are applied, the torque-bearing capacity decreases slowly with the increase of horizontal force, and when the horizontal force increases to a certain value, the value of the torque decreases significantly; and (3) the shape of the H–T failure envelope of the bucket foundation has no obvious change, vertical load have less effect on horizontal and torque load.

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Section: Bearing Capacity Characteristics Of Cbf Under Different Loadsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Bearing Capacity Characteristics of Composite Bucket Foundation Under Torque Loading

Zhang

et al. 2019

Energies

Self Cite

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“…As a new kind of foundation of offshore wind power, composite bucket foundations have the advantages of convenient transportation, low installation cost, and cyclic utilization, which have great promise future in the offshore wind turbine industry [3][4][5][6][7]. In the actual marine environment, the composite bucket foundation is subjected to a complex load situation, not only by the longterm self-weight load V of the wind turbine superstructure but also by the horizontal load H, the moment load M, and the torque load T transmitted by the wind turbine blade structure [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…e water flowing around the foundation tends to produce a scouring vortex, which will take away the soil around the foundation and form different degrees of the horseshoe-shaped scouring pit. e scouring pits can significantly reduce the burial depth of the foundation and consequently affect the bearing capacity and stability of the foundation [9,18]. Yu et al [18] investigated the scour characteristics of unidirectional flow action on composite bucket foundations by a series of scale model tests.…”

Section: Introductionmentioning

confidence: 99%

“…With experimental tests, Chen et al [19] investigated the effect of scouring on the stability of the bucket foundation subjected to cyclic wave loading and found that the stability of the foundations gradually decreased as the depth of scouring increased. Zhao et al [9] studied the load-bearing characteristics of the composite bucket foundation under different scour depths and scour ranges through the finite element method. Lu et al [20] numerically analyzed the variation in the vertical ultimate bearing capacity and the foundation failure mechanisms of the bucket foundation in silty clay soil under unilateral scour conditions.…”

Section: Introductionmentioning

confidence: 99%

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Failure Envelopes of Composite Bucket Foundation for Offshore Wind Turbines under Combined Loading with considering Different Scour Depths

Jing

Wang

Huang

et al. 2021

Shock and Vibration

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The composite bucket foundation of offshore wind turbines is subjected to a variety of loads in the marine environment, such as horizontal load H, vertical load V , bending moment M, and torque T. In addition, due to the characteristics of its connection section, the water flow around the foundation will produce scour pits of various degrees, reducing the depth of the bucket foundation, which has a nonnegligible impact on the overall stability of the bucket foundation. In this paper, the failure envelope characteristics of different combinations of loads on bucket foundations, including V -H-T, V -M-T, conventional V -H-M, and noncoplanar V -H-M, are numerically investigated with considering different scour depths. The numerical results indicate that the V -H-T, V -M-T, conventional V -H-M, and noncongruent V -H-M failure envelopes gradually shrink inwards with increasing scour depth, and the stability of the composite bucket foundation decreases; the conventional V -H-M failure envelope shows an asymmetry of convexity to the right, and the noncongruent V -H-M failure envelope shows an asymmetry of outward convexity to the left and right. The corresponding mathematical expressions for the failure envelope are obtained through the normalized fitting process, which can be used to evaluate the stability of the bucket foundation based on the relative relationship between the failure envelope and the actual load conditions, which can provide practical guidance for engineering design.

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Failure Envelopes of Single-Plate Rigid Helical Anchors for Floating Offshore Wind Turbine

Chen,

Wang,

Tian

et al. 2023

China Ocean Eng

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Scour effects on bearing capacity of composite bucket foundation for offshore wind turbines

Cited by 25 publications

References 20 publications

Bearing Capacity Characteristics of Composite Bucket Foundation Under Torque Loading

Bearing Capacity Characteristics of Composite Bucket Foundation Under Torque Loading

Failure Envelopes of Composite Bucket Foundation for Offshore Wind Turbines under Combined Loading with considering Different Scour Depths

Failure Envelopes of Single-Plate Rigid Helical Anchors for Floating Offshore Wind Turbine

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