Disturbance Mechanism of Pipe-Jacking Construction on Surrounding Environment

To determine the impact of pipe-jacking construction on the surrounding environment, engineering data was collected and combined with case monitoring results to study the mechanism and laws of surface and existing tunnel deformation caused by pipe-jacking construction. The conclusions are as follows: (1) The settlement law of the surface section conforms to the Peck formula, with an influence range of about 1.4~2.6 times the diameter of the top pipe. The surface deformation development curve is divided into two forms: "uplift first and then settlement" and "full settlement". (2) The overall uplift of existing tunnels presents a "reverse" Peck curve, and the uplift amount was affected by the stiffness of the existing tunnel and the magnitude of the disturbance it is subjected to. With the increase of time, the uplift amount first increases rapidly and then tends to stabilize. (3) Monitoring and analysis were conducted on the pipe-jacking project of the existing tunnel, and the deformation patterns of the surface and tunnel were basically consistent with existing research patterns. Several measures were taken to control the deformation of the surface and existing tunnel, with a maximum settlement of about 11 mm on the surface and a maximum uplift of about 1.6 mm on the existing tunnel. The research results can provide certain references for the design and construction of related pipe-jacking.