Bearing Capacity of the High-Rise Pile Cap Foundation for Offshore Wind Turbines

Qi, Wen-Gang; Tian, Jingkui; Zheng, Hong-You; Wang, Haiyan; Yang, Jing; He, Guoqiu; Gao, Fu‐Ping

doi:10.1061/9780784413470.044

Cited by 6 publications

(4 citation statements)

References 15 publications

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“…The bridge structure in the river is not only subjected to the general erosion of the section under the bridge but also to the local erosion around the pier, which is especially strong during the flood [22]. Local scour is a phenomenon in which the soil around the bridge pier is eroded due to the complicated vortex flow field structure caused by the water flow blocking near the bridge pier.…”

Section: Scour Mechanismmentioning

confidence: 99%

“…When the water hits the pier, the upflowing water creates a surge height in front of the pier, while the downflowing water forms a vortex at the bottom of the river that is opposite to its flow direction [23]. When the water flows around the pier side, it forms horseshoe eddies and wake eddies on the The bridge structure in the river is not only subjected to the general erosion of the section under the bridge but also to the local erosion around the pier, which is especially strong during the flood [22]. Local scour is a phenomenon in which the soil around the bridge pier is eroded due to the complicated vortex flow field structure caused by the water flow blocking near the bridge pier.…”

Section: Scour Mechanismmentioning

confidence: 99%

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Study on the Influence of Water Erosion on the Bearing Capacity and Function of the High Pile Foundation of the Wharf

Yang,

Zhang,

et al. 2024

Water

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High-pile foundation is a common form of deep foundation commonly used in ocean environments, such as docks and bridge sites. Aiming at the problem of bearing capacity of high pile foundations, this paper proposes the calculation of bearing capacity and the analysis of scour depth of high pile foundations under the action of scour based on the modified p-y curve. In this paper, three kinds of scour mechanisms—natural evolution scour, general scour, and local scour—are described; and the calculation methods of scour widely used at present are compared and analyzed. The solution of the vertical stress of soil around the pile under local scour is solved and applied to the β method to solve the lateral resistance of the pile under local scour. The local erosion is equivalent to the whole erosion, and the expression of the ultimate soil resistance before and after the equivalent is calculated, respectively, according to the principle that the ultimate soil resistance at a certain point above the equivalent pile end remains unchanged. The distance from the equivalent soil surface to the pile end can be obtained simultaneously, and then the equivalent erosion depth, p-y curve of sand at different depths, and high pile bearing capacity can be obtained. Finally, it is found that the bending moment of a single pile body varies along the pile body in the form of a parabola, and the maximum bending moment of the pile body is below the mud surface and increases with the increase in horizontal load. When the scouring depth is 30 m, the horizontal load is 25 KN, and the maximum bending moment of the pile body is about 150 N·m. The data with a relative error greater than 10% accounted for only 16.6% of the total data, and the error between the calculated value and the measured value was small. The formula can predict the erosion depth more accurately.

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Section: Scour Mechanismmentioning

confidence: 99%

Section: Scour Mechanismmentioning

confidence: 99%

Study on the Influence of Water Erosion on the Bearing Capacity and Function of the High Pile Foundation of the Wharf

Yang,

Zhang,

et al. 2024

Water

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“…The steel winged monopiles are assumed to be linearly elastic with Young's modulus E p = 210 GPa and Poisson's ratio ν p = 0.3, similar to previous studies on pile foundations [27][28][29]. The Young's modulus of sand E s for describing the elastic behavior is stress-dependent and increases with the earth pressure at rest [30]:…”

Section: Constitutive Modelmentioning

confidence: 99%

Lateral Bearing Capacity of a Hybrid Monopile: Combined Effects of Wing Configuration and Local Scour

Wang

et al. 2022

JMSE

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Pile foundations for offshore wind turbines are subjected to large lateral loads. By mounting wings on the perimeter of regular monopiles, winged monopiles have shown better performance in resisting deformation under horizontal loading. However, the hazardous effect of local scour on the lateral bearing capacity of winged monopiles installed in the sandy seabed has not been systematically evaluated. In this study, a modified Mohr–Coulomb model considering the pre-peak hardening and post-peak softening behavior of dense sand is adopted to simulate laterally loaded winged monopiles in the locally scoured sandy seabed, using three-dimensional finite element analyses. The effect of local scour depth on the lateral capacity of winged monopiles is examined and explained by soil failure mechanisms. The enhancement of lateral capacity with wings attached to the monopile is demonstrated to be more effective than extending pile embedment length. The effects of the relative density of sand and the wing load orientation are also discussed. Finally, the wing efficiency is evaluated to determine the optimal configuration of winged monopiles.

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“…The factors such as water depth, soil conditions, and installed capacity of wind turbine should be fully considered in the foundation selection. The main foundation types for wind turbines include monopiles, jacket foundations, bucket foundations, gravity foundations, high pile cap foundations, and floating foundations [2][3][4][5]. Among them, the jacket foundations have large stiffness, which can transfer the overturning moment into axial push-pull force to improve the overturning resistance.…”

mentioning

confidence: 99%

Bearing Characteristics of Tripod Bucket Jacket Foundation for Offshore Wind Turbines in Sand under Monotonic Loads

Wang

Gan

et al. 2022

JMSE

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Tripod bucket jacket foundation is an alternative foundation solution for deep-sea wind farms. This paper analyzes and compares the bearing characteristics of two tripod bucket jacket foundations with different height-diameter ratios, the tripod suction pile jacket foundation (TSPJF) and tripod bucket jacket foundation (TBJF), under different monotonic loads. The bearing modes of the two foundations under the vertical loads are different. The ultimate vertical load is mainly borne by the inside frictional resistance for the TSPJF, while it is mainly borne by the lid resistance for the TBJF. The foundations will take place translation and rotation under horizontal load. Under the positive x-axis loading, the vertical resistance of the TSPJF and TBJF is mainly composed of the soil resistance on the 1# bucket lid, the inside and outside frictional resistance. Under the negative x-axis loading condition, the vertical resistance is mainly composed of the inside and outside frictional resistance of buckets. The ultimate moment capacities of the TSPJF and TBJF in loading of the single bucket in compression is significantly larger than that in loading of the single bucket in tension. The failure mode of the TSPJF and TBJF in loading of the single bucket in tension is the pull-out failure of the bucket in tension.

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Bearing Capacity of the High-Rise Pile Cap Foundation for Offshore Wind Turbines

Cited by 6 publications

References 15 publications

Study on the Influence of Water Erosion on the Bearing Capacity and Function of the High Pile Foundation of the Wharf

Study on the Influence of Water Erosion on the Bearing Capacity and Function of the High Pile Foundation of the Wharf

Lateral Bearing Capacity of a Hybrid Monopile: Combined Effects of Wing Configuration and Local Scour

Bearing Characteristics of Tripod Bucket Jacket Foundation for Offshore Wind Turbines in Sand under Monotonic Loads

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