Analysis on Overall-Carrying-Soil Effect of Shallow-buried Rectangular Pipe Jacking Construction

With the construction of urban comprehensive pipe gallery in full swing, the rectangular jacking pipe construction has gradually been widely used due to its high section utilization rate and slight impact on the surrounding environment. With the development of urban underground space, there will be more and more rectangular pipe jacking projects. For the shallow buried rectangular pipe jacking, the most critical problem is the overall-carrying-soil effect, which will adversely affect the project. Based on a shallow buried rectangular pipe jacking project, the numerical simulation of the pipe jacking construction process is performed using finite element method to analyze the overall-carrying-soil effect of surrounding soil during the construction of pipe jacking. The simulation results show that (1) The maximum of the overall-carrying-soil effect caused by the shallow buried rectangular pipe jacking construction is above the pipeline axis, and the range of the overall-carrying-soil effect increases with the pipe jacking construction; (2) During the construction of pipe jacking, the overall-carrying-soil effect of subsequent jacking pipe section is greater than that of the previous jacking pipe section.