Lateral response of monopile reinforced by cement-improved soil in clay to monotonic and cyclic loadings: Laboratory model test and theoretical investigation

OuYang, Haoran; Dai, Guoliang; Gao, Luchao; Wang, Anhui; Gong, Weiming

doi:10.1016/j.marstruc.2023.103403

Cited by 19 publications

(4 citation statements)

References 25 publications

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“…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%

“…Dai et al [9] considered different cement-grouting methods and found that jet-grouting provided the greatest improvement. Ouyang et al [10] developed modified p-y curves for cement-reinforced monopiles in soft clay based on a laboratory model test. Nevertheless, all the aforementioned results mainly focused on onshore slender piles, and very few investigations on monopiles for OWTs have been conducted that provided accurate soil resistance distribution for reinforced large-diameter monopiles.…”

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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Section: Introductionmentioning

confidence: 99%

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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“…Kiani et al [19], Hossain et al [20], and Heo et al [21] showed the relationship between the SCP arrangement and the deformation of the foundation. Moreover, the piles can significantly improve the lateral bearing capacity of the foundation and effectively increase the foundation densification and the effective stress of the soil around the piles [22][23][24][25]. A large number of analysis methods show that the pile-soil interaction under dynamic loads is similar to that of Euler-Bernoulli beams and Pasternak foundations [26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Deformation and Stress Analysis of Pile-Supported Immersed Tunnels under Seismic Loads

Zhuang,

Fan,

et al. 2023

Applied Sciences

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The stress and deformation of pile-supported immersed tunnels under seismic loads is a critical issue in tunnel design. This paper utilizes ABAQUS (version 2020) finite element software to analyze the seismic load response of the sand compaction pile-immersed tunnel–seawater pressure (SIS) system, which is verified by a physical model. The study shows that the suppression effect of the seawater on the vertical frequency of the tunnel increases with depth. When the replacement rate of the piled foundation reaches 50%, the deformation of the tunnel “H-shaped” structures increases, which also changes the vertical frequency of the tunnel. However, the presence of the suppression effect causes resonance injury at the far end of the tunnel from the earthquake source, resulting in a shift of the peak stress point. It was also found that seawater pressure affects the resistance–deflection (p-y) at the tip of the pile more than at the end of the pile. The slenderness ratio (γ) of the pile affects the p-y value at the end of the pile more than at the tip of the pile. The connection between the piled foundation and the tunnel is most stable when γ is in the range of 9.25 to 15.

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Numerical Analysis of Creep Effects on the Settlement of PHC Pipe Pile in Soft Clay Treated by Deep Mixing Method

Jun,

Junsheng,

Wannian

et al. 2024

Geotech Geol Eng

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Lateral response of monopile reinforced by cement-improved soil in clay to monotonic and cyclic loadings: Laboratory model test and theoretical investigation

Cited by 19 publications

References 25 publications

Numerical simulation of offshore monopiles with reinforcement in shallow soil layer

Numerical simulation of offshore monopiles with reinforcement in shallow soil layer

Deformation and Stress Analysis of Pile-Supported Immersed Tunnels under Seismic Loads

Numerical Analysis of Creep Effects on the Settlement of PHC Pipe Pile in Soft Clay Treated by Deep Mixing Method

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