To study the law of surface displacement during piperoof construction of pipe-jacking group

this paper analyses surfacedisplacement data based on the Tianlin Road passing under Middle Ring RoadTunnel Project in Shanghai. Measured data shows that deformation development during the pipe roofconstruction can be divided into seven stages: 4 construction stages and 3suspending construction stages. The surface displacement during the pipe roofconstruction comprises ground loss settlement and ground heave caused bygrouting. In the suspension stages

the surface displacement is consolidationsettlement. In this paper

the surface displacement is described by the Peckequation. The width coefficient of surface settlement troughandthe ground loss ratio were backanalyzed from the field measured data. Based on the analysis results

thecalculation formulas of and were proposed for Shanghai soft clay. is related withthe pipe radius

pipe buried depth and internal frictionangle of soil

and the formula of is described by a hyperbolic functionof time after jacking. The surface heave caused by the grouting can beseparated to the negative ground loss caused by each pipe jacking withgrouting. The above method was used to predict the surface displacement and thepredicted results were compared with measured data to verify the correctness ofthe method in this paper

which can provide scientific reference for theprediction of surface displacement caused by similar pipe roof methodconstruction.