Theoretical analysis of three-dimensional mechanical model of curved pipe jacking and its application

The largediameter and curved pipe jacking technique has applied successfully in soft soil of Shanghai, but it is required to study and discuss the effect of curved pipe jacking construction on the surrounding soft ground and the internal forces and deformations of pipe.Based on the classic elastic theory,the threedimensional mechanical model of interaction between curved pipe and soil ground is established using thinshell theory and Winkler’s assumption,to simulate the mechanical behavior of construction of pipe jacking in soft soil. The theoretical solutions of longitudinal and transverse deformations along curved pipe axis are given, and thus the internal forces of pipe and the ground resistance are also deduced. It is shown by comparison between the theoretical and measured values that the theoretical result is reasonable. 