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Experimental study of submarine landslide impact on offshore wind power piles

FENG Bin;SUN Honglei;CAI Yuanqiang;PAN Xiaodong;SHI Li;Department of Architecture Engineering,Zhejiang University of Technology;Department of Architecture Engineering,Zhejiang University;  
In order to analyse the magnitude of debris flow impact forces on offshore wind power piles,we adjusted the contents of Kaolin clay and sand to generate debris flows with different rheological properties and densities. The rheological properties of debris flows were described by H-B model and power rate model. At different flow rates and viscosities,the impact of debris flow on model piles was simulated by using a self-made submarine landslide model flume. Based on the theory of fluid mechanics,the relationship between the drag coefficient and the Reynolds number of non-Newtonian fluids was established. The results show that the viscosity and flow velocity of the debris flow are the main factors affecting the impact of the submarine landslide,and the impact force of submarine landslide increases with the increase of debris flow velocity and the viscosity. Considering the shear thinning of the debris flow,the fitting formula of the pile resistance coefficient varying with the non-Newton Reynolds number was obtained to provide a reference for the design of the submarine pile foundation.
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