Research on Segments Mechanical Performance of Shield Tunnels Beneath Pass the End Bearing Pile Group Foundation
In view of the situation that the shield tunnel beneath pass the end bearing pile group foundation,the finite element method is used to compare and analyze the stress and deformation characteristics of the segment structure under the condition of pile,no pile and different vertical clear distance from pile bottom to tunnel top.The results show that the stress and deformation of the segment structure are large when the tunnel beneath pass the end bearing pile group foundation,and it is more likely to mutate at the side pile.The smaller the vertical clear distance from the bottom of the pile to the top of the tunnel,the greater the stress and deformation of the segment structure,and the more significant the increase of the inner bending moment value.Through the Mindlin stress formula,the additional stress value of the vault is obtained,which is added to the overall stress calculation of the segment structure,it can be used as a safety reserve for the construction of the shield tunnel beneath pass the end bearing pile group foundation.
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