Experimental study of grouting protection against local scouring of monopile foundations for offshore wind turbines

Zhang, Fengpeng; Chen, Xuguang; Feng, Tao; Wang, Yang; Liu, Xixi; Liu, XueLin

doi:10.1016/j.oceaneng.2022.111798

Cited by 22 publications

(8 citation statements)

References 27 publications

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“…Hence, it might be beneficial to reinforce the soils in upper layers more. Additionally, the reinforcement can also reduce the negative effects of scour [2,3].…”

Section: Introductionmentioning

confidence: 99%

“…In the case of laterally loaded monopiles for OWTs, reinforcing the shallow soils is more economical. A few scholars have studied cement-reinforced monopiles in the waters of China, which is required owing to the poor soil conditions in this sea area [3,[7][8][9][10]. He et al [11] investigated cement-reinforced slender piles under static lateral load by field tests and finite element method (FEM) based on the concrete damage plasticity (CDP) model, and proposed its progressive damage mechanism.…”

Section: Introductionmentioning

confidence: 99%

“…Traditional cement grouting is generally significantly effective [3,[7][8][9][10][11][12][13]; however, it releases a large amount of carbon dioxide during production, which is not environmentally friendly. In recent years, a new alternative has emerged in the form of microbially induced carbonate precipitation (MICP) technology.…”

Section: Introductionmentioning

confidence: 99%

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Numerical simulation of offshore monopiles with reinforcement in shallow soil layer

Zhu,

He,

Guo

2024

IOP Conf. Ser.: Earth Environ. Sci.

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With the development of large-scale offshore wind turbines (OWTs), monopile foundations require larger diameter and greater embedded depth to satisfy the higher bearing requirements. Large-diameter monopiles for OWTs are mainly loaded horizontally, and the horizontal resistance provided by the shallow soil plays an important role in the loading of the monopile foundation. Therefore, shallow soil reinforcement (such as cement grouting and bio-grouting) is an effective method to improve the bearing capacity of the monopile. In this study, the lateral static loading mechanism of a shallow-layer reinforced monopile was investigated by finite element method (FEM). The effect of reinforcements with different stiffness values (elastic modulus), different strengths (cohesion and friction angle) and different reinforced ranges (width and depth) was analyzed on the lateral bearing capacity, deformations, soil resistances, and soil resistance per unit length to pile deflection (p-y) curves of monopiles. Based on the numerical results, an empirical formula was proposed for predicting the reinforcement coefficient of the bearing capacity. The effects of different reinforcement parameters on the distribution of soil resistance were analyzed, and the soil resistances obtained by FEM were compared with those from a theoretical formula. It was found that the resistance provided by the reinforced soil was clearly reduced at the interface with the unreinforced soil, and the resistance of the unreinforced soil was not significantly affected by the reinforced soil.

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“…Hence, it might be beneficial to reinforce the soils in upper layers more. Additionally, the reinforcement can also reduce the negative effects of scour [2,3].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical simulation of offshore monopiles with reinforcement in shallow soil layer

Zhu,

He,

Guo

2024

IOP Conf. Ser.: Earth Environ. Sci.

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“…With the continuous development of large-size fixed-bottom OWTs, local scour and scour protection of pile foundation have become a common issue (Wang et al, 2020;Wang et al, 2019;Zhang et al, 2022). Scour has a significant impact on the dynamic characteristics, vibration magnitudes, and thus fatigue life of OWTs under wind and wave loads.…”

Section: Introductionmentioning

confidence: 99%

Effect of scour on the fatigue life of offshore wind turbines and its prevention through passive structural control

Cao,

Wu,

Yang

et al. 2024

Wind Energ. Sci.

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Abstract. Offshore wind turbine (OWT) support structures are exposed to the risk of fatigue damage and scour, and this risk can be effectively mitigated by installing structural control devices such as tuned mass dampers (TMDs). However, time-varying scour altering OWTs' dynamic characteristics has an impact on the TMD design and fatigue life, which has rarely been studied before. In this paper, a simplified modal model is used to investigate the influence of scour and a TMD on the fatigue life evaluation of a 5 MW OWT's support structure, and a traditional method and a newly developed optimization technique are both presented to obtain TMD parameters. This optimization technique aims at finding optimal parameters of the TMD which maximize the fatigue life of a hotspot at the mudline, and the effect of time-varying scour can be considered. This study assumes that the TMD operates in the fore–aft (FA) direction, while the vibration in the side–side (SS) direction is uncontrolled. Results show that scour can decrease the fatigue life by about 24.1 % and that the TMD can effectively suppress vibration and increase the fatigue life. When the scour depth reaches 1.3 times the pile diameter, the TMD with a mass ratio of 1 % can increase the fatigue life of an OWT's support structure by about 64.6 %. Further, it is found that the fatigue life can be extended by 25 % with the TMD optimized by the proposed optimization technique rather than using a traditional design method which does not take the change in dynamic characteristics into account.

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“…1 The properties of zero autogenous shrinkage and water absorption were suitable for secure installation in marine environment. 2 Rapid strength build-up and high fatigue resistance makes high-performance grouting materials particularly suitable for marine structures that are exposed to very high dynamic loads. 3,4 However, grouting materials are subjected to complex stresses in the grouted connection section of marine structure, and the crack initiation and propagation in the grouting material will have a great impact on the mechanical properties and fatigue properties of the grouted connection section.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation of mixed mode fracture of high‐performance grouting materials based on peridynamics

Yao

Chen

et al. 2023

Fatigue Fract Eng Mat Struct

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This paper investigates the fracture behavior of high‐performance grouting materials in the grouted connection section of marine structures, where they are subjected to complex stress states. This study utilizes a combination of experimental and numerical simulation methods to establish a reliable numerical simulation technique for the fracture process of high‐performance grouting materials. The mixed mode fracture behavior is analyzed using six different types of specimens, and the strain contour is analyzed using the Digital Image Correlation technique. An extended peridynamics model is proposed for the numerical simulation, which adopts a fracture criterion based on strain energy density. The accuracy of the model is verified qualitatively and quantitatively, and the simulation results are consistent with the experiments. Overall, this study provides insights into the fracture behavior of high‐performance grouting materials in complex stress states and presents a reliable numerical simulation technique for the fracture process.

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Experimental study of grouting protection against local scouring of monopile foundations for offshore wind turbines

Cited by 22 publications

References 27 publications

Numerical simulation of offshore monopiles with reinforcement in shallow soil layer

Numerical simulation of offshore monopiles with reinforcement in shallow soil layer

Effect of scour on the fatigue life of offshore wind turbines and its prevention through passive structural control

Experimental and numerical investigation of mixed mode fracture of high‐performance grouting materials based on peridynamics

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