Study On Analysis Model And Dynamic Response Of Cable Break And Collision In Submerged Floating Tunnel

In modern society with more and more developed transportation,people have been concerned more and more about how to cross the vast water area quickly and safely after the fast passage of land and air has been established.In the past about the development of traffic facilities,the main transportation is a bridge across the waters,the second is the immersed tube tunnel,although the two kinds of transportation can help people cross river and sea,but there are limits,construction of the bridge pay special attention to the local terrain characteristics,build a bridge in the rugged place not appropriate,the other is limited,the applicable scope of the immersed tube tunnel.It has higher requirements on seabed soil quality and water depth.Therefore,as a new kind of underwater suspension tunnel cross tunnel structure form of the deep sea received the widespread attention of experts and scholars,because of its advantages in deepwater area of traffic,research and development of underwater suspension tunnel is more and more attention,even if the world now has built underwater suspension tunnel case of success.After the systematic data review,it is found that most of the researches on underwater suspension tunnel tend to focus on the influence of wave fluid on the tunnel,but few researches on the impact of underwater suspension tunnel.Generally,there are two kinds of impacts on underwater suspension tunnel: one is the impact on the anchor cable,resulting in the sudden break of the anchor cable;The second is to impact the tunnel pipe body,causing tunnel concrete damage.Either way,it will seriously affect the normal operation of the submerged floating tunnel.Therefore,this paper uses finite element software to conduct a simple study on the movement phenomenon of the submerged floating tunnel under the sudden break of the supporting cable and the damage of the submerged suspension tunnel after being hit by the debris of the sunken submarine.The main research contents are as follows:(1)Firstly,this paper introduces some basic concepts of submerged floating tunnel and its research and development status at home and abroad,and gives a detailed description of the research ideas and content of this paper.(2)The four layout methods of the anchor cable and the sag effect of the anchor cable are expounded,and the basic theory of the element life and death method and the basic calculation formula of the collision force of the simulation method of the anchor cable fracture are introduced.(3)3d model by using ABAQUS software to build submerged floating tunnel,analysis the reverse movement of the tunnel after unilateral anchor cable fault phenomenon,respectively consider single anchor cable fault and two continuous fracture,fracture and end and middle of cable-anchors single anchor cable tunnel tube body under the fracture stress,deformation and movement characteristics,analyzed the influence of the factors affecting the gravitational buoyancy ratio.Then according to the simplified model of cable-stayed bridge,the fish-bone model of the simplified model of underwater suspension tunnel is proposed.(4)The finite element software ABAQUS was used to study the damage,energy change and impact force time history of SFT tube body after it was hit by shipwreck or submarine debris.The vertical downward forward impact and lateral horizontal impact were respectively considered,and the impact of impact objects with different mass and different initial velocity on tube body damage,ability and impact force were considered.