The distribution regularity of total additive load induced by bulkhead additive thrust

force of friction between shield and soil

and force of friction between follow-up pipes and soil during pipe jacking construction is studied. The analytical results show that

the distribution regularity of additive load is closely related with the relative position of pile and shield; and it is a three-dimensional problem. Toward the pipe jacking direction and perpendicular to the pipe wall

the additive load is changed from pressure to pull force along with the pass of shield excavation face. In addition

the value and influence bound of additive load in pipe jacking direction is bigger than that of perpendicular to the pipe wall. Value of additive load in vertical direction is small. Direction of additive load close to the axes of pipeline is opposite with that of both ends; and the force distribution curve is arch-shaped. The value of additive load is increased rapidly with decrease of distance between pile foundation and pipeline.