The submarine pipeline laid on the shallow foundation of the deep sea is prone to axial expansion and contraction under the action of high temperature and high pressure during operation

and this movement will intermittently shear the shallow soil around the pipe. Therefore

it is necessary to investigate the mechanism of tube-soil interaction during the axial movement of the pipeline. In this paper

a small strain finite element analysis of the axial motion of a shallowly buried pipeline during operation is established based on the modified Cambridge model. In the process of axial movement of pipelines with different initial depths

the development curve of axial resistance (S-shaped consolidation curve) in critical plastic shear consolidation stage is fitted. The variations of the excess pore water pressure

the friction coefficient of the pipe-soil interface

the wedging factor ζ and the axial resistance between pipes and soils are discussed. It is found that the peak excess pore pressure generated by axial shear is a function of velocity and time. As the axial velocity decreases

the value of the peak excess pore pressure decreases and the time point of the peak pore pressure is delayed. The internal mechanism of the transition from undrained condition to drained condition in the process of axial movement is expounded.