Numerical Analysis Of Wave-induced Dynamics Of A Rubble Mould Breakwater At Yantai Port

Studying and analyzing the dynamic response of structures to waves is the basis for judging whether structural structures will be destroyed or not.It can obtain structural damage mechanisms and provide scientific basis for the early design,optimization,and maintenance of structures in actual projects.It is of great significance to study such issues by avoiding the huge loss of property caused by design flaws or improper maintenance at a later stage.Through the comprehensive analysis of the site investigation report and experimental data of the riprap breakwater in the West Port of Yantai Port,the parameters of the wave,seabed and breakwater were selected.Using the FSSI-CAS2D coupled numerical model solver to simulate the wave-seabed-breakwater interactions at the extreme high water level and great wave conditions encountered in50 years.Having analyzed the dynamic response of riprap breakwaters in the West Port of Yantai Port under the action of waves:The hydrodynamic analysis was performed for the fluid domain to calculate the level of waves on the breakwaters.Thrust force;Analysis of the dynamic response of the breakwater;Analysis of the liquefaction form and liquefaction depth of the seabed.Concluded as follow:For the practical project of Yantai Port Stone-breaking Breakwater,under extreme high water level and high wave conditions,the breakwater can fully exert its protection against the impact.Although the flow will occur during the impact of the wave on the breakwater,the water behind the breakwater is basically not affected.The bed was not significantly disturbed;Breakwaters are periodically loaded by waves,and the horizontal thrust on each floor shows a periodic change.With the formation of standing waves in the later period,the height of the waves will gradually increase,and the horizontal thrust of the breakwater will increase.The thrust amplitude Gradually increase.After wave stability the dynamic horizontal thrust is 210 kN/mmUnder the effect of wave circulation,the third layer of the breakwater(EFKL layer)is the most easily disturbed area.The turbulence energy in this area reaches a maximum of 2.6 m~2/s~2,and the dynamic horizontal stress experienced by the front-side area of this layer is nearly 8 kPa,the shear stress received is up to 10 kPa,which is very likely to be damaged.In the later period of the breakwater,the protection should be emphasized;Transient liquefaction occurs on the surface of the seabed in front of the breakwater(on the sea side).The maximum liquefaction depth is only 1 m.There is no accumulation of pore pressure in the seabed and no cumulative liquefaction occurs,which has no significant effect on the overall stability of the breakwater.Breakwaters will not be dumped and destroyed.All the reaserch are made in The Institute of Rock and Soil Mechanics,chinese Academy of sciences.