Prototype testing for the partial removal and re-penetration of the mooring dolphin platform with multi-bucket foundations

Le, Conghuan; Ding, Hongyan; Zhang, Puyang

doi:10.1016/j.marstruc.2017.12.008

Cited by 14 publications

(3 citation statements)

References 22 publications

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“…The undrained capacities of a single-suction foundation in clay have been studied by means of theoretical analyses [2][3][4][5][6][7], physical investigations [8][9][10][11][12][13][14][15], finite-element analysis [16][17][18][19][20][21][22][23][24] and artificial intelligence methods [25][26][27]. Aubeny and Murff (2005) [2] established a plastic limit solution for the capacity of a single-suction anchor in undrained clay.…”

Section: Introductionmentioning

confidence: 99%

“…A program of testing of caisson foundations in clay at the Bothkennar test site relevant to the design of foundations for offshore wind turbines is described [10]. The partial removal, adjusting and re-penetrating tests for a mooring dolphin platform with three-bucket foundations after a seven-year service were introduced [11]. The suction caisson was pulled out at a certain loading angle to obtain the failure modes and corresponding capacities after applying many one-way cyclic loadings in the model tests [12].…”

Section: Introductionmentioning

confidence: 99%

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Formulas for Uniaxial Capacities of Tetrapod Bucket Foundations Considering Group Effects in Undrained Clay

et al. 2022

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Suction bucket foundation is a novel and cheaper foundation used in marine structures, such as offshore wind turbines, breakwater and oil platforms. Compared with a single bucket foundation, tetrapod bucket foundations can bear larger loads because of the group effects. However, the vertical, horizontal and moment capacity factors of tetrapod bucket foundations have not been presented in existing specifications. A series of three-dimensional finite-element analyses were conducted to investigate the group effects on uniaxial capacities and failure mechanisms of tetrapod bucket foundations in undrained clay considering various foundation separation distance ratios, embedment depth ratios, soil-strength heterogeneity indices and load direction angles. Generalized formulas for undrained uniaxial capacities of tetrapod bucket foundations were proposed in order to establish a bridge connecting the capacities of tetrapod bucket foundations and those of the single bucket foundation, which can provide a reference for industrial designs of capacities of tetrapod bucket foundations. The results show that the vertical group effect factor of tetrapod bucket foundations is basically not affected by the foundation separation distance ratio, embedment depth ratio, soil-strength heterogeneity index and load direction angle, which can adopted 0.9 based on a conservative estimation. The normalized horizontal and moment group effect factors of tetrapod bucket foundations are both affected by the separation distance ratio, embedment depth ratio and soil-strength heterogeneity index, but the moment group effect factor is also obviously affected by the load direction angle. The value of the horizontal and moment capacity factors of tetrapod bucket foundations are about 2.3 and 13.8 times that of a single bucket foundation, respectively, when the separation distance ratio is 3.5, embedment depth ratio is 1.0 and soil-strength heterogeneity index is 10, which have both been significantly enhanced. A value of 3.5 is suggested for the separation distance ratio to attain good capacities and a relatively high global stiffness for the tetrapod bucket foundations.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Formulas for Uniaxial Capacities of Tetrapod Bucket Foundations Considering Group Effects in Undrained Clay

et al. 2022

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“…Among them, the jacket foundations have large stiffness, which can transfer the overturning moment into axial push-pull force to improve the overturning resistance. A bucket foundation is a promising option for its convenient offshore construction [6][7][8]. Bucket jacket foundation (BJF) is a new type of foundation for supporting offshore wind turbine that combines jacket foundation and bucket foundation [9][10][11].…”

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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Solution to critical suction pressure of penetrating suction caissons into clay using limit analysis

Zhang

2020

Applied Ocean Research

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Prototype testing for the partial removal and re-penetration of the mooring dolphin platform with multi-bucket foundations

Cited by 14 publications

References 22 publications

Formulas for Uniaxial Capacities of Tetrapod Bucket Foundations Considering Group Effects in Undrained Clay

Formulas for Uniaxial Capacities of Tetrapod Bucket Foundations Considering Group Effects in Undrained Clay

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

Solution to critical suction pressure of penetrating suction caissons into clay using limit analysis

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