The Experimental Study Of Wave Forces Acting On Perforated Caisson On Rubble Mound Foundation

The implementation of the strategy of "One belt and One road", which will promote the infrastructure construction of connectivity, it also puts forward a new project of traditional Marine engineering building requirements. Structure characteristics of the perforated caisson make incident wave and reflected wave form of phase difference, which can effectively reduce the wave energy in front of the caisson, thereby significantly reducing the reflection coefficient of structures, the wave force and the wave run-up. Compared with the entity caisson, perforated caisson reduces the project cost. Therefore, in recent years in coastal and ocean engineering has received the widespread attention and application. Perforated caissons are often built on rubble mound foundation in practical engineering. The research of wave acting on perforated caisson is still rare. In this paper, the wave acting on perforated caisson on rubble mound foundation has been systematical investigated, which can be available in practical engineering design.Through 2D experiment in wave flume at Dalian University of Technology, the horizontal and the vertical wave force between regular and irregular waves and perforated caissons on rubble foundation have been investigated. At the same time, use and compare with the previous test data. During the experiment, In the experiment, entity separately test of straight wall and the perforated caisson structure;In perforated caisson experiment design, the selection of different wave chamber width, opening rate, bed height, in order to contrast analysis.In this paper, the method of single dimensional correlation analysis was carried out on the experimental data of the system analysis, dimensionless processing, the experiment physical quantity examine relative width, relative wave chamber height, wave steepness, relative water depth, the porosity and so on various influence factors on perforated caisson under the influence of the total wave force, find out the relationships between the influence factors and the ratio of the perforated caisson and the straight wall by the total horizontal force (the total vertical force), the total horizontal(vertical) force corresponding the moment of crest(valley) value of total vertical (horizontal)force.Calculation formula is given by using least-square method, within the scope of the test conditions, the calculated value is in good agreement with the test results. Irregular wave test data generally greater than the regular wave test data, or by the irregular wave test data fitting the results of the calculation formula can be given security. With the current "standard of design and construction of breakwater", wave force formula is given under the condition of perforated caissons on dark bed,By comparing and analyzing the standard formula and the calculation formula in this paper, which proved that the results could provide the reference for the construction and design.