Analysis on Mechanical Behavior of Pile Foundation Construction of Urban Underground Tunnel Close to Existing Railway Bridge
Taking a bridge foundation project across a railroad as the research object,the displacement,bending moment and surface settlement law of pile foundation during the shield crossing are analyzed by means of theoretical analysis and numerical simulation.The conclusions show that the changes of transverse displacement and bending moment of pile foundation are mainly concentrated in the depth where the shield tunnel is located.The closer the pile foundation is to the shield tunnel,the more obvious the changes of transverse displacement and bending moment are.The bending moment of pile foundation between the two tunnels is much larger than the bending moment of pile foundation on both sides of the tunnel.The pile foundation between the two tunnels shows the change trend of increasing and then decreasing bending moment and displacement with the excavation of right line and left line.And the displacement and bending moment are the largest when the right line tunnel completely penetrates the pile foundation.The maximum is about 3～4 times after the excavation is completed.
construction mechanicsshield tunnelapproaching constructionnumerical simulation
NETL
NSTL
万方数据
