Field Test and Numerical Simulation of Jacking Force of Reinforced Concrete Pipe Jacking in Long Distance Composite Formation

Jacking force is one of the important parameters of pipe jacking construction. In order to analyze the mechanical properties of large-diameter reinforced concrete pipe jacking construction in composite strata, based on the reinforced concrete pipe jacking project of the Jiaoliu River pressureless cave of Inner Mongolia water diversion project from ChaorHe to Liaoning, the jacking force, face resistance, circumferential pressure and strain were monitored. According to the field measured data, the friction coefficient of the pipe jacking through different strata was calculated. Then, the three-dimensional finite element model of pipe jacking construction is established by ABAQUS numerical simulation software. The calculated friction coefficient is substituted into the numerical model. The simulated jacking force is calculated by the numerical simulation results. The measured jacking force, the simulated jacking force and the predicted jacking force based on the prediction model of jacking force proposed by Staheli are compared. The results show that compared with the predicted jacking force, the simulated jacking force is consistent with the measured jacking force, which indicates that the parameters obtained based on the field measured data are substituted into the numerical model. The accuracy of the calculated numerical simulation results is very high. The method of predicting the jacking force in this study can also provide a reference for similar projects in the future.