1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China;
2. MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou 310058, China;
3. College of Architecture and Civil Engineering, Wenzhou University, Wenzhou 325035, China
A three-dimensional numerical model of bore against sheet-pile groin was illustrated. The governing equations were discredited by the finite volume method, and the Reynolds equations and the RNG κ-ε turbulent model were solved by the pressure implicit splitting-operator (PISO)method. The position of free surface was obtained by using the volume of fluid (VOF) method. The model was verified by the flume experiment research with the comparison between the numerical results and experimental data in good agreement. The proposed model can be used to simulate the velocity vectors, free water surface, bore pressure of a groin: (1) The flow near the groin changes strongly with backwater, hydraulic jump and vortex behind the head of groin when the bore impacts the groin; (2)The pressure is much larger at the toe and root of groin on the impacted surface and the maximum pressure increases linearly with the bore height and the initial water depth respectively, while it decreases rapidly when the water permeability rate enlarges; (3)The pressure of front piles is larger at the root of groin, and it is linear distribution along the height with the maximum value at the initial water surface, and the maximum pressure increases quickly when the bore height accretes, while it has a rapid decrease when the water permeability rate enlarges, but it has little change under different initial depths. The maximum pressure of back piles is at the head and the top of groin．
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