Research On Anchored Foundation Of Submerged Floating Tunnel

Submerged Floating Tunnel(SFT)is a new type of traffic form.It is not affected by weather and sea passage compared to the bridge across the sea;and it is less affected by factors such as complex terrain than undersea tunnels.Therefore,the SFT is a form of transportation with great potential for development.In the part of the SFT,the anchoring foundation has a great influence on the safety and stability of the SFT.However,there are not any existing SFT yet.So this paper will study the anchoring foundation of the SFT,and the main contents including the following aspects.The bucket foundation with better economy is chosen as the anchoring foundation of the SFT and the ABAQUS finite element analysis software is used to simulate the bucket foundation.Firstly,the influence of the friction coefficient between bucket wall and soil on the ultimate uplift bearing capacity of bucket foundation is analyzed.Through the analysis of the calculation results,we got the friction coefficient in the clay and sandy soil is 0.45 and 0.6,then the numerical simulation results are compared with the solid model test data to verify the feasibility of the numerical simulation method.In view of actual engineering application,six kinds of the bucket foundations with different sizes are simulated by finite element numerical simulation.First,we analyze the variation rule of ultimate uplift bearing capacity of the bucket foundation with different length-diameter ratio.It is found that for the same height of the bucket foundation,the ultimate uplift bearing capacity increases as the length-diameter ratio decreases.Then the ultimate uplift bearing capacity of bucket foundation under different load angles is calculated,and the damage forms of soil around the foundation under different load angles are analyzed.It is found that when the loading angle is small,the uplift bearing capacity of bucket foundation is stronger but the damage of soil is more serious,when the loading angle is larger,the damage of soil is less,but the uplift bearing capacity is lower.