Influence of vertical loads on lateral behaviour of monopiles in sand

Mu, Linlong; Kang, Xudong; Feng, Kai; Huang, Maosong; Cao, Jie

doi:10.1080/19648189.2017.1359112

Cited by 25 publications

(20 citation statements)

References 36 publications

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“…observed behavioral trends, rather its presence would lower the effective unit weight of the sand. A similar treatment can be observed in Mu et al (2018); Verdure, Garnier, and Levacher (2003); Klinkvort and Hededal (2013); LeBlanc, Houlsby, and Byrne (2010); and Li, Haigh, and Bolton (2010).…”

Section: Geotechnical Testing Journalsupporting

confidence: 74%

Centrifuge Modeling of the Impact of Local and Global Scour Erosion on the Monotonic Lateral Response of a Monopile in Sand

Prendergast

Askarinejad

et al. 2020

Geotechnical Testing Journal

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The majority of offshore wind turbines are founded on large-diameter, open-ended steel monopiles. Monopiles must resist lateral loads and overturning moments because of environmental (wind and wave) actions, whereas vertical loads tend to be comparatively small. Recent developments in turbine sizes and increases in hub heights have resulted in pile diameters increasing rapidly, whereas the embedment length to diameter ratio (L/D) is reducing. Soil erosion around piles, termed scour, changes the soil strength and stiffness properties and affects the system's load resistance characteristics. In practice, design scour depths of up to 1.3D are routinely assumed during the turbine lifetime; however, the impact on monopiles with low L/D is not yet fully understood. In this article, centrifuge tests are performed to assess the effect of scour on the performance of piles with low L/D. In particular, the effect of combined loads, scour type (global, local), and depth are considered. A loading system is developed that enables application of realistic load eccentricity and combined vertical, horizontal, and moment loading at the seabed level. An instrumented 1.8-m-diameter pile with L/D = 5 is used. A friction-reducing ball-type connection is designed to transfer lateral loads to the pile without inducing any rotational pile-head constraint, which is associated with loading rigs in tests of this nature. Results suggest that vertical and lateral load interaction is minimal. Scour has a significant impact on the lateral load-bearing capacity and stiffness of the pile, leads to increases in bending moment magnitude along the pile shaft, and lowers the location of peak pile bending moment. The response varies with scour type, with global scour resulting in larger moments than local scour. The size of the local scour hole is found to have a significant impact on the pile response, suggesting that scour hole width should be explicitly considered in design.

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Section: Geotechnical Testing Journalsupporting

confidence: 74%

Centrifuge Modeling of the Impact of Local and Global Scour Erosion on the Monotonic Lateral Response of a Monopile in Sand

Prendergast

Askarinejad

et al. 2020

Geotechnical Testing Journal

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“…They found that with the exception of extremely high axial loads bordering on monopile axial capacities, variation in axial load does not have a significant effect on ultimate lateral capacity and lateral displacement of monopiles. Mu et al [65] conducted a series of model tests to investigate the influence of vertical loads on the lateral response of a monopile in sandy soil. Mu et al [65] found that the presence of a vertical load improves the lateral behaviour of the monopile.…”

Section: Monopile Behaviour Under Combined Axial and Lateral Loadingmentioning

confidence: 99%

“…Mu et al [65] conducted a series of model tests to investigate the influence of vertical loads on the lateral response of a monopile in sandy soil. Mu et al [65] found that the presence of a vertical load improves the lateral behaviour of the monopile.…”

Section: Monopile Behaviour Under Combined Axial and Lateral Loadingmentioning

confidence: 99%

“…The influence of vertical load on the p-y curve around the monopile was also examined, to inform better monopile design. Mu et al [65] proposed several equations to evaluate the degree of this improvement, and hence calculate the lateral responses of the monopile based on the traditional design method. The coupled effect of vertical loads and lateral loads on a monopile under different soil conditions remains not fully understood, and more research is required in the future.…”

Section: Monopile Behaviour Under Combined Axial and Lateral Loadingmentioning

confidence: 99%

See 1 more Smart Citation

Foundations of offshore wind turbines: A review

et al. 2019

Renewable and Sustainable Energy Reviews

340

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Offshore wind is a source of clean, renewable energy of great potential value to the power industry in the context of a low carbon society. Rapid development of offshore wind energy depends on a good understanding of technical issues related to offshore wind turbines, which is spurring ongoing research and development programmes. Foundations of offshore wind turbines present one of the main challenges in offshore wind turbine design. This paper reviews the present state of knowledge concerning geotechnical and structural issues affecting foundation types under consideration for the support structures of offshore wind turbines, and provides recommendations for future research and development.

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“…Karthigeyan et al [11], Chien et al [12], Lee et al [13], and Mu et al [14] have found that pile responses under combined loads differ significantly from those under pure vertical or pure horizontal loads. Mu et al [15] studied the responses of a single pile under the combined effect of vertical and transverse loads through a series of experiments and found that vertical loads can increase the horizontal resistance of a single pile. These studies did not consider the soil masses surrounding the pile.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation Study on Lateral Displacement of Pile Foundation and Construction Process under Stacking Loads

Cai

et al. 2018

Complexity

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Lateral displacement of pile foundation is crucial to the safety of an overall structure. In this study, a numerical simulation on the lateral displacement of pile foundation under stacking loads was conducted to determine its relation with different influencing factors. Simulation results demonstrated that stacking loads at the pile side mostly influence the lateral displacement of pile foundation. The lateral displacement of pile foundation increases by one order of magnitude when the stacking loads increase from 100 kPa to 300 kPa. Other influencing factors are less important than stacking loads. Lateral displacements of the pile body and at the pile top can be reduced effectively by increasing the deformation modulus of surface soil mass, reducing the thickness of soft soil, and expanding pile diameter. Our analysis indicates that a nonlinear relationship exists between the lateral displacement at the pile top and the pile diameter. The lateral resistance of the pile body can be enhanced by coupling the stacking load along piles and the axial force at the pile top. An actual large-scale engineering project was chosen to simulate the effects of postconstructed embankment on lateral displacement and axial force of bridge pile foundation under different construction conditions and to obtain the lateral displacement of the pile body and the negative frictional resistance caused by soft soil compression under stacking loads. On the basis of the calculated results, engineering safety and stability were evaluated, and a guide for the design and construction was proposed.

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Influence of vertical loads on lateral behaviour of monopiles in sand

Cited by 25 publications

References 36 publications

Centrifuge Modeling of the Impact of Local and Global Scour Erosion on the Monotonic Lateral Response of a Monopile in Sand

Centrifuge Modeling of the Impact of Local and Global Scour Erosion on the Monotonic Lateral Response of a Monopile in Sand

Foundations of offshore wind turbines: A review

Numerical Simulation Study on Lateral Displacement of Pile Foundation and Construction Process under Stacking Loads

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