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学者姓名：黄卫
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Abstract ：
Earthquakes occur frequently in China's southeast coastal areas. Therefore, in this region, offshore wind turbine (OWT) structures are highly likely to be simultaneously affected by wind, waves and earthquakes. Firstly, based on the wave theory and Snell's law, this paper deduces the formulas for the equivalent seismic nodal force of layered soils suitable for viscoelastic artificial boundaries. Compared with a method that employs an average modulus to calculate the seismic motion input of layered soils, the proposed formulas enable more accurate simulation of seismic wave propagation in layered soils. Based on the formulas, an integrated numerical model incorporating a nacelle, tower, monopile and layered seabed is established to analyse the dynamic response of large-diameter monopiles of OWTs under stochastic wind, wave and seismic loads. The analysis results show that the displacement and stress responses under combined wind-wave loads are larger than those under the individual wind/wave load, showing obvious amplification effects, but the maximum acceleration at the mudline indicates an inhibitory effect, which is not consistent with a superposition principle. Under the combined wind-wave-seismic loads, the monopile acceleration is primarily attributable to the seismic load, with wind and wave loads mitigating the acceleration response caused by the seismic load. Moreover, the seismic load has little effect on the monopile's stress but increases its displacement, especially at the mudline. Thus, additional treatment for foundation deformation is needed for the monopile design in seismic areas. © 2025
Keyword ：
Dynamic response Dynamic response Earthquakes Earthquakes Loads (forces) Loads (forces) Offshore oil well production Offshore oil well production Offshore wind turbines Offshore wind turbines Seismic design Seismic design Seismic waves Seismic waves Stochastic models Stochastic models Stochastic systems Stochastic systems Viscoelasticity Viscoelasticity Wave propagation Wave propagation
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| GB/T 7714 | Chen, Zhibo , Chen, Feng , Liu, Haibo et al. Dynamic response of offshore wind turbine monopile foundations in layered soils under wind, wave and earthquake actions [J]. | Applied Ocean Research , 2025 , 162 . |
| MLA | Chen, Zhibo et al. "Dynamic response of offshore wind turbine monopile foundations in layered soils under wind, wave and earthquake actions" . | Applied Ocean Research 162 (2025) . |
| APA | Chen, Zhibo , Chen, Feng , Liu, Haibo , Cao, Guangwei , Huang, Wei . Dynamic response of offshore wind turbine monopile foundations in layered soils under wind, wave and earthquake actions . | Applied Ocean Research , 2025 , 162 . |
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Abstract ：
In the macroscopic soil mechanic experiment, the occurrence of cracks and failures of clay soil is intimately related to the nanoscale shear behavior of clay mineral sheets, which urgently needs to be studied. The two basal surfaces of kaolinite have different wettabilities with water molecules, thereby playing a significant role in microshear processes. In this article, the molecular dynamics (MD) simulation method was used to study the shear properties of hydrated kaolinite as a function of the water content and wettability Three shear models with different wettability (i.e., the hydrophilicity and hydrophobicity) and water content were established. According to the stick-slip effect of the curves of friction, 1W (one layer of saturated water molecules between clay mineral sheets) is the microplastic limit water content of kaolinite that transitions from brittle failure to ductile failure. By analyzing the basal spacing and the shear viscosity in the hydrophilic/hydrophobic model, the mosaic layer and vacuum layer at the clay-water interface and the condensation behavior of water molecules were observed. The friction of hydrated kaolinite was weakened significantly by the interparticle water film, which decreases by 64.30%-98.38% compared to the dry case. In hydrated kaolinite, the hydrophilic model has the strongest interfacial friction force due to the strong interaction between clay-water. While in dry cases the interfacial friction of the hydrophobic model is not the weakest among the three models, as the interaction between clay-clay has a larger component in the friction direction. Additionally, the hydrophilic/hydrophobic basal surface of hydrated kaolinite exhibits unique shear properties by affecting the interfacial friction, the hydrogen bond effect, and the flow of interparticle water. The simulation study on the shear behavior of hydrated kaolinite explains the microscale failure mechanism of clay soil, which has significance for disaster prevention and reduction projects such as landslide treatment.
Keyword ：
failure failure kaolinite kaolinite molecular dynamics molecular dynamics shear shear water film water film wettability wettability
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| GB/T 7714 | Lu, Ming , Huang, Wei , Zheng, Yuan-Yuan . Molecular Dynamics Simulation Study of the Effects of Water Content and Wettability on the Shear Properties of Kaolinite for the Failure of Clay Soil [J]. | ACS APPLIED NANO MATERIALS , 2024 , 7 (3) : 2843-2854 . |
| MLA | Lu, Ming et al. "Molecular Dynamics Simulation Study of the Effects of Water Content and Wettability on the Shear Properties of Kaolinite for the Failure of Clay Soil" . | ACS APPLIED NANO MATERIALS 7 . 3 (2024) : 2843-2854 . |
| APA | Lu, Ming , Huang, Wei , Zheng, Yuan-Yuan . Molecular Dynamics Simulation Study of the Effects of Water Content and Wettability on the Shear Properties of Kaolinite for the Failure of Clay Soil . | ACS APPLIED NANO MATERIALS , 2024 , 7 (3) , 2843-2854 . |
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