Analytical and Numerical Analyses on Vertical Site Responses of Submarine Permafrost in Polar Ocean

Yunyu Chen, Qiang Li, Minjie Wen, Yifei Wang and Weiwei Duan
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Yunyu Chen: Department of Infrastructure Management, Wenzhou Medical University, Wenzhou 325035, China
Qiang Li: Department of Civil Engineering, Zhejiang Ocean University, Zhoushan 316022, China
Minjie Wen: Research Center of Coastal Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China
Yifei Wang: Department of Civil Engineering, Zhejiang Ocean University, Zhoushan 316022, China
Weiwei Duan: Department of Civil Engineering, Zhejiang Ocean University, Zhoushan 316022, China

Energies, 2022, vol. 15, issue 16, 1-13

Abstract: Submarine permafrost is widely distributed in polar ocean, which has an important impact on polar engineering and subsea energy exploitation. According to the frozen porous medium theory, an analytical solution of the one-dimensional vertically dynamic response of the submarine permafrost is derived by using the Laplace transform and the separation variable method. Using the general forms of partial differential equations and the pressure acoustics module in COMSOL software, a finite element model of submarine permafrost overlying a seawater layer is established. The results show that the degraded solution agrees well with the existing results of the vertically dynamic response of the saturated soil layer in the seabed, and the analytical and numerical solutions are in good agreement. The water depth, saturation and temperature have important effects on the dynamic responses of submarine permafrost. When the soil layer is fully saturated, the water depth has a weak effect on resonance frequency. However, if not fully saturated, even a small amount of air bubbles will have a significant impact on the resonance frequency of the soil layer, and this effect increases with the increase of water depth. The effect of temperature on the nearly saturated permafrost layer is also significantly higher than that on the saturated permafrost layer.

Keywords: energy geotechnics; submarine permafrost; frozen porous medium; dynamic response; resonance; analytical solution; COMSOL (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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