Deformation and Mechanical Characteristics of Pile Foundation Buttresses for Bridges under Metro Tunnels
The meteoric expansion of metro construction will inevitably lead to conflicts emerging between the metro line and the current bridge pile foundation.To uphold the safety of the viaduct and guarantee the concurrent conclusion of the metro tunnel's construction,the replacement of the pile foundation on the viaduct becomes paramount.The underpass of the Guihuang Road viaduct in the section tunnel between Huaguoyuan West Station and Huaguoyuan East Station of Guiyang Metro Line 3 was taken as the research object.Employing finite element software,a numerical simulation encompassing the entire process of pile foundation replacement and tunnel construction was executed.By juxtaposing this with field monitoring data,the precision of the simulation results was thoroughly analyzed and confirmed.Furthermore,a thorough examination of the bridge's deformation patterns and the pile foundation's force variations during the replacement process was conducted.The results show that the utilization of passive replacement technology and a replacement bearing platform as the bridge's bearing structure during pile replacement effectively redirects the bridge superstructure load to the replacement system upon the truncation of existing piles.Initially,the abutment experiences a rise,followed by settlement,and ultimately stabilization,with both the bridge deformation and the replacement system's force remaining within safe thresholds.However,it is observed that the force and settlement of the replacement pile are not uniform.Remarkably,the tunnel's construction crossing has minimal impact on the new replacement system,indicating that the pile foundation replacement scheme is not only safe and feasible,but also has minimal implications for the integrity of the new system.
pile foundation replacementnumerical simulationmetro tunnelmonitoring data
万方数据
维普
