Capacity of modified suction caissons in marine sand under static horizontal loading

Li, Dayong; Zhang, Yukun; Feng, Lingyun; Gao, Yufeng

doi:10.1016/j.oceaneng.2015.04.033

Cited by 95 publications

(14 citation statements)

References 29 publications

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“…In test, the relative density for the marine fine sand for all the tests should be in the same state so that the test results can be reproducible. en, prior to the start of each test, the marine fine sands in the tank should be loosened to a depth of about 1.5 times the height of foundation so that the same stress level could be achieved [21]. e foundation model was buried into the loosened marine fine sands, then the water was poured into the tank, and the water level was kept to 3 cm high above the sand surface.…”

Section: Testing Proceduresmentioning

confidence: 99%

H-M Bearing Capacity of Cone-Shaped Foundation for Onshore Wind Turbine under Monotonic Horizontal Loading

Xing

Liu

et al. 2019

Advances in Materials Science and Engineering

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In this paper, monotonic horizontal loading tests were carried out to study the bearing capacity of the cone-shaped foundation in marine fine sand. With load-controlled methods, the horizontal load was applied to the rod of cone-shaped foundation at loading eccentricity ratios of 5.0, 6.0, and 7.0. In addition, theoretical analysis was used to investigate the horizontal ultimate bearing capacity, and finite element analysis was also used in this paper to investigate the influence factors of the bearing capacity of cone-shaped foundation. Based on the theoretical analysis, the formula for horizontal ultimate bearing capacity was deduced. Test results show that, at the same loading eccentricity, cone-shaped foundation can provide higher H-M bearing capacity as well as lower lateral deflection compared to regular circular foundation for wind turbines. In addition, the deflection-hardening behavior of load-deflection curve for cone-shaped foundation is also observed. Numerical analysis results show that the H-M bearing capacity of the cone-shaped foundation increases with increasing aspect ratio and buried depth, however, and decreases with increasing loading eccentricity. Based on the results from finite element analyses, several equations to calculate the maximum moment bearing capacities are put forward, which take the aspect ratio, loading eccentricity, and embedded depth into account.

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Section: Testing Proceduresmentioning

confidence: 99%

H-M Bearing Capacity of Cone-Shaped Foundation for Onshore Wind Turbine under Monotonic Horizontal Loading

Xing

Liu

et al. 2019

Advances in Materials Science and Engineering

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“…A number of studies on caisson foundations were carried out to investigate the influence of the aspect ratio L/D, experimental (Cassidy et al, 2006;Houlsby et al, 2005;Ibsen et al, 2013Ibsen et al, , 2015Tran and Kim, 2017;Zhang et al, 2007;Zhu et al, 2014) and numerical (Cassidy et al, 2006;Cheng et al, 2016;Gerolymos et al, 2012;Li et al, 2015;Liu et al, 2014;Zafeirakos and Gerolymos, 2016). In these studies, the L was changed while D was kept constant (or vice versa) and therefore the contact surface area was different.…”

Section: Influence Of the Aspect Ratio L/d For The Same Soil-structurmentioning

confidence: 99%

“…The response of a caisson foundation in sand subjected to combined loading has been recently simulated with different constitutive models, such as a plasticity constitutive model governed by the Mohr-Coulomb failure criterion (Achmus et al, 2013;Liu et al, 2014;Zafeirakos and Gerolymos, 2016), the NGI -ADP model with an anisotropic undrained shear strength failure criterion (Skau et al, 2018) and an elastoplasticity model called Hardening Small stain Soil model (HSS) which can reproduce basic macroscopic phenomena in the soil (Li et al, 2015). The calibration strategy of the soil parameters is also of great importance.…”

Section: Introductionmentioning

confidence: 99%

“…The calibration strategy of the soil parameters is also of great importance. Some studies adopt back calculations from experimental field tests or empirical formulas (Achmus et al, 2013;Zafeirakos and Gerolymos, 2016), the representative soil strength profile of specific areas when the relevant soil parameters are not available (Liu et al, 2014;Skau et al, 2018) or triaxial tests and back analysis using the finite element method (Li et al, 2015). However, the full numerical analyses with different scales from laboratory to in-situ conditions including large deformation phases (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Advanced numerical modelling of caisson foundations in sand to investigate the failure envelope in the H-M-V space

et al. 2019

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This paper focuses on the identification of the failure envelope of a caisson foundation in sand using an advanced critical state-based sand model (SIMSAND) and the Combined Lagrangian Smoothed Particle Hydrodynamics Method (CLSPH). The parameters of the SIMSAND constitutive model are first calibrated using triaxial tests on Baskarp sand. In order to validate the combined CLSPH-SIMSAND approach, a cone penetration test, model tests and a field test on a reduced scale caisson foundation are simulated. After full numerical validations with different scales from laboratory to in-situ conditions, a numerical parametrical study is then introduced considering different sand properties (density, friction angle, deformability, crushability) and caisson dimensions (soil-structure contact surface area, diameter-depth ratio) and complex combined loading paths to identify the failure envelope in the horizontal force (H), bending moment (M), vertical force (V) space. The influence of the caisson foundation contact surface area, aspect ratio and soil parameters are considered and quantified. Finally, an analytical formula is proposed for the 3D failure envelope in the H-M-V space.

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“…Offshore wind farms have been widely developed in recent years due to abundant offshore wind, lack of occupied land, and lack of pollution. Common types of offshore wind power generator foundations include single pile foundations, gravity foundations, jacket foundations, and floating foundations [1,2]; however, bucket foundations have been widely examined and employed in recent years due to their simple construction, low cost, and recyclability [3][4][5][6][7][8]. In 2018, the world's largest single-capacity 8.8 MW wind turbine was successfully installed in the Aberdeen offshore wind farm in Scotland, and its foundation consists of four bucket foundations with a diameter of 9.5 m and height of 15 m [9].…”

Section: Introductionmentioning

confidence: 99%

Model Tests of Soil Reinforcement Inside the Bucket Foundation with Vacuum Electroosmosis Method

et al. 2019

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Offshore wind turbine foundations are commonly subjected to large horizontal, vertical, and bending moment loads. Marine soils have high moisture content, high compressibility, high sensitivity, and low strength, resulting in insufficient foundation bearing capacity. In order to improve the bearing capacity of wind turbine foundations and reduce foundation settlement, an internal vacuum preloading method combined with electroosmosis reinforcement is used to reinforce the soil within bucket foundations. The pore water pressure, vertical settlement, pumping quality of the soil during the reinforcement process, soil moisture content before and after the reinforcement, and undrained shear strength were analyzed. Horizontal and vertical bearing capacity model tests were carried out on the reinforced and nonreinforced soil inside the bucket foundation. Results show that vacuum preloading combined with electroosmosis reinforcement reduces soil moisture content inside the bucket foundation by approximately 20%, and the undrained shear strength of the internal soil increases by approximately 20 times. Soil reinforcement has high spatial uniformity. Results of the bucket foundation bearing capacity model show that when the soil inside the bucket foundation is strengthened, horizontal bearing capacity increased by 2.9 times and vertical bearing capacity increased by 2.1 times. Vacuum preloading combined with electroosmosis reinforcement can effectively improve the shear strength of soft soil and enhance the bearing capacity and stability of bucket foundations.

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Capacity of modified suction caissons in marine sand under static horizontal loading

Cited by 95 publications

References 29 publications

H-M Bearing Capacity of Cone-Shaped Foundation for Onshore Wind Turbine under Monotonic Horizontal Loading

H-M Bearing Capacity of Cone-Shaped Foundation for Onshore Wind Turbine under Monotonic Horizontal Loading

Advanced numerical modelling of caisson foundations in sand to investigate the failure envelope in the H-M-V space

Model Tests of Soil Reinforcement Inside the Bucket Foundation with Vacuum Electroosmosis Method

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