Research On Two-lay Perforated Vertical Type Wave Dissipation Plate Structure

With the improvement of the port and the coast protection technology, the vertical type breakwater requirements in engineering practice is higher and higher. In order to reduce the wave reflection and the structure force, also to lower the project cost,many countries have conducted researches to study new type of breakwaters in recent years.Under this background, this paper puts forward a new kind of perforated upright type breakwater structure patterns -- two-layer perforated upright energy dissipation plate structure.Because open hole structure can effectively reduce wave energy, decreasing embankment reflection, but the interaction mechanism with the waves and breakwater structure is extremely complex, for waves and perforated structure of related theory still not mature, and can be used in engineering practice about the transmission coefficient and wave force research method is little, so it is very necessary to research two-layer perforated upright energy dissipation plate structure .Firstly, According to the characteristics of wave,three kinds of opening rate (4.6% circular openings, 18.3% circular openings, 32.1% of combination of double holes) two-layer porous upright energy dissipation plate structure model are designed with the width as same as the water lume.Two-dimensional physica model test is tested in the water lume , research the interacting of waves and two-layer perforated upright energy dissipation plate.Experiment common range waves are selected in project, study wave transmission of the two-layer porous upright structure, using wave mapping and acquisition system respectively gather the wave height change datas, analyse and calculate each type two-layer perforated upright energy dissipation plate structure of transmission coefficient K_t .Through the analysis of the transmission coefficient K_t and non-dimensional quantity wave steep H/L, relative plate spacing s/d, relative depth d/H, opening rate A/A_o, research the correlation between the two-layer perforated upright energy dissipation plate structure of wave elimination performance. And compare with the double orifice opened upright breaker plate structure types, it is concluded that good performance model structural geometry.Secondly using pressure sensors and acquisition system to collect the same position surface pressure data of each structure .Wave and vertical structure breakwaters function theory is analyzed, and the three kinds of opening rate model structures'surface point pressure are analyzed, two-layer porous upright energy dissipation plate structure's wave pressure distribution function is researched. Compare the wave pressure distribution of perforated and entity erect board, comparing validation two-layer porous upright energy dissipation plate structure under wave loading superiority.Finally, using the ADINA finite element software establish physical structure, adopt periodic loads on structure's surface, analyzes the stress distribution and displacement distribution, which provide reference for model transformation and practical use for.