Monitoring and Analysis of Long Distance Pipe Jacking Construction

Taking the second phase drainage pipe jacking project of Meilan Airport in Haikou city as the engineering background, since the axis of pipe jacking process inevitably deviates, the friction resistance and jacking force of pipe section under the condition of deviated jacking are studied on the original basis, and the force law of multi-row pipe jacking is studied through the force monitoring data of three rows of pipe jacking on site. By analyzing the field monitoring results of jacking force, internal force and contact pressure of pipe and soil, it can be concluded that the longitudinal stress value of pipe joint in jacking soil is basically the same, but the longitudinal stress of pipe joint in jacking soil increases with the increase of jacking distance, and the variation curve of earth pressure around pipe is relatively gentle, which decreases first and then tends to be constant. As Drive 2 is in the superposition area of soil disturbance between Drive 1 and Drive 3, with the jacking of Drive 1 and Drive 3, there is a certain soil extrusion effect on the pipe section of Drive 2, resulting in a significant increase of soil pressure on the pipe side of Drive 2.