In recent years,large cross-section multi-pipe jacking has become a new construction method for the construction of rail transit stations.The impact of multi-pipe jacking project on the surrounding environment such as bridge pile foundation cannot be ignored under different construction sequences.However,there are few relevant engineering case studies at present.Taking the pipe jacking project of Shanghai Rail Transit L14 Jing'an Temple Station as the background,with the help of numerical software,this paper establishes the model of the impact of multi-pipe jacking construction on the existing bridge pile foundation,and analyzes the impact of different construction sequences on the bridge pile foundation and surface settlement.Through comprehensive analysis and induction,it is found that deep pipe jacking followed by shallow pipe jacking is conducive to controlling the impact of ground deformation on the surrounding environment.Firstly,the pipe jacking which is a little far away from the pile foundation can effectively reduce the disturbance effect of subsequent pipe jacking construction on the environment.The first impact of pipe jacking construction on the close pile foundation is often significant,and the embodiment degree of the shielding effect of the first construction structure is related to the distance between the first pipe jacking and the close pile foundation.
large sectionrectangular pipe jackingconstruction sequencebridge pile foundation
NETL
NSTL
万方数据
