| Based on the wave elimination mechanism that the arc-slab permeable levee structure can destroy the horizontal and vertical movement of the water quality point,this paper proposes a new type of perforated slab permeable embankment on the basis of previous studies,namely the upper arc slab double-layer arc plate structure with round openings on the wave side and square openings on the lower arc plate to face the waves.The article is carried out on the basis of the physical model test.The model structure produced by a scale reduction is placed in the wave current tank system,and the artificial wave tank wave system is used to simulate the actual wave effect.Arrange the wave height meter and pressure sensor and other instruments to count the test data of the structure under different working conditions,and after processing the data,explore the law of change,so as to explore the hydrodynamic performance of the structure.By summarizing the test data,we can get the changing laws of transmission coefficient,reflection coefficient,pressure,total wave force,etc.,and after analyzing and comparing these factors,the following research results are obtained:1.The transmission coefficient is not significantly affected by the plate spacing.Whether it is to create different working conditions by changing the latent depth of the perforated slab-type permeable embankment or adjusting the wave height,the transmission coefficient is not greatly affected by the plate spacing;the overall transmission coefficient appears to follow the latent depth increases and decreases;the overall transmission coefficient increases with the increase of the wave height,but it gets close when the wave height are 0.08 m and 0.10m;the transmission coefficient firstly increases and then decreases with the increase of the relative plate width.2.There is a big difference when the model is at different diving depths,which is to change the wave height to explore the change trend of the reflection coefficient..The reflection coefficient decreases with the increase of the wave height in the diving state;when the water is out and flat,the reflection coefficients of the model are similar when the wave height are 0.08 m and 0.10 m.,and the reflection coefficient fluctuates obviously when the wave height is 0.06m;changing the plate spacing,the reflection coefficient does not change significantly under different working conditions,and the wave elimination effect of the model is less affected by the plate spacing;changing the latent depth,opening the hole when the slab transparent dike model is in the diving state,the performance of the reflection coefficient is quite different from that of the perforated slab transparent dike model in flat water and out of water.,the latter has better wave-eliminating effect and more stable.3.The curves of positive pressure and negative pressure on the upper and lower surfaces of the double-arc plate of the perforated slab-type permeable dike are mostly symmetrical about the horizontal axis.The upper plate is closer to the water surface,and the wave impact is greater.The measured values of positive wave pressure and negative wave pressure are larger than those of the other surfaces.The wave pressure value measured on the lower surface of the lower plate is the smallest,and the wave pressure fluctuations at different points are also small;from the perspective of wave pressure,the plate spacing shows little effect to the force characteristics of the slab permeable embankment model.4.Under the same working condition,the total vertical wave force of the perforated slab permeable dike model is greater than the total horizontal wave force,and the value of the total vertical wave force is about 3 times the total horizontal wave force,reflecting the effect of the perforated slab on the vertical wave suppression is greater than that on the horizontal wave suppression,and the total wave force on the diving embankment is smaller and more stable than the outlet embankment and the flat water embankment. |
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