Study On Underwater Explosion Shrinkage Model Test And Damage Mode Of Piled Wharf

China is a major maritime country,and its naval vessels undertake such tasks as maritime reconnaissance,training and transportation,providing a huge guarantee for safeguarding China’s maritime rights and interests.As the rear support of naval vessels,the military wharf also undertakes the tasks of berthing,loading and unloading materials,maintenance and so on.Its structure to the void structure,suitable for soft soil area,the upper terminal panel for concrete pouring,supported by tens of metres into the underground depth of pile foundation,because of its length is hundreds of meters,and belongs to the statically indeterminate structure,so the general equivalent of ammunition for air explosive or penetration explosion is hard to destroy them,this paper damage by underwater explosion,The damage mode of piled wharf was studied.First,this paper analyze the previous piled wharf test,including the damage mechanism,such as bubble jet,bubble pulsation,shock wave damage to its,and found that the dock trials deficiency in past,the main reason lies in the high pile wharf belongs to the statically indeterminate structure,combined with the unreasonable shrinkage ratio,makes the explosion is hard to make it produce damage over a long distance.Therefore,in domestic experiments on high-piled wharfs,the detonation source is often set below the wharfs in order to cause damage to the wharfs.As a result,domestic researches on the damage of high-piled wharfs mostly focus on the anti-detonation performance of concrete structures.Secondly,starting from the vulnerability of piled wharf,this paper analyzes that piled wharf is not easy to damage after undergoing explosion.In order to explore the damage mode of piled wharf,the characteristics of wharf targets and typical striking weapons are introduced and analyzed first,and then the damage mode of piled wharf is summarized on the basis of previous studies.Again,this article from the perspective of economic perspective,and shorten the test cycle through similarity theorem,to the shrinkage ratio of 1:3 piled wharf,has carried on the special handling to not similar quantities,at the same time,this article also to reliable explosive source than design,satisfies high pile wharf model and prototype geometric similar,movement similar,dynamic similar,To ensure that the damage mode presented by the highpiled wharf test is consistent with the prototype,based on the damage mechanism of the previous high-piled wharf,the measured data of this high-piled wharf are summarized.The measuring techniques used in this experiment are introduced,such as binocular measuring principle,strain gauge measuring principle,low frequency oscillator principle and so on.Finally,this paper analyzes the test data,including acceleration,strain,displacement and other data,and on this basis,analyzes and summarizes the damage mode and mechanism of the wharf :（1）The damage of piled wharf includes the pile foundation damage caused by shock wave,bubble pulsation,jet flow and other reasons.（2）Due to the high center of gravity of piled wharf,huge waves are generated by underwater explosion,and low order modes are easily excited to form large resonant deformation under strong impact from side.Thus,the damage mode of whole pile foundation fracture caused by overall displacement is proposed.