Theoretical model for analyzing the whole development process of carrying-soil effect due to jacking of shallow-buried rectangular pipe
Considering the carrying-soil effect resulting from the jacking of shallow-buried rectangular pipes,a theoretical model for analyzing the entire construction process,covering the vertical extension phase,the horizontal extension phase,and overall carry-soil phase is proposed.The methods for calcu-lating the loosening soil pressure,pipe-soil friction,side wall shear resistance,and front end friction resistance are determined.The theoretical formulas to identify the initiation and development of carry-ing-soil effect are established.The results show that the initiation of carrying-soil effect primarily depends on factors such as the thickness of the overlying soil layer,soil characteristics,and pipe-soil friction,rather than the jacking length.During the vertical and horizontal spreading phases,the thick-ness and width of the carried soil layer exhibit nonlinear increases with the elongation of the jacking process.These findings align well with the outcomes obtained through three-dimensional finite element simulations of rectangular pipe jacking and the field tests.In conclusion,the theoretical formulas offer an effective approach for predicting the initiation and evolution of carrying-soil effects resulting from the jacking of rectangular pipes.
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