Estimation of jacking force in large rectangular section vertical curve pipe:a global displacement control finite element model
To estimate the jacking force in large rectangular section vertical curve pipe,a finite element analysis model of global movement control was established,and the fitting relationship between jacking force and jacking distance was obtained.In comparison to a finite element analysis model utilizing piecewise displacement control,our approach eliminates the need for superimposing jacking force,side resistance,and end resistance,thereby allowing for a natural mechanical connection between pipe sections.Furthermore,we accounted for the impact of pipe joint rotation on the jacking force,resulting in a simpler and more accurate calculation process.Our findings reveal that,under similar conditions,the jacking force estimated with the global displacement control finite element analysis model surpasses that derived from the piecewise displacement control finite element analysis model.When considering different side friction coefficients of 0.20 and 0.38,it was observed that the former exhibits greater jacking force than the latter throughout the entire fitting section.Specifically,with a side friction coefficient of 0.30,the former demonstrates higher values than the latter in the middle and front sections(jacking distance≤30 m),while displaying lower values in the middle and rear sections(jacking distance>30 m).This highlights the significance of accounting for joint rotation angle's influence on jacking force,emphasizing the superiority of the global displacement control finite element method in estimating curved pipe jacking forces.For vertical pipe jacking operations involving specific dimensions and burial depths,pivotal factors influencing jacking force include the size and distribution range of grouting pressure between the pipe jacking system and surrounding rock,as well as the rotational angle of the vertical pipe joint at the axial turning point.
global displacement controlAbaqusjacking forcerectangular pipe jacking
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