Additive Load Influence Analysis of Shield Tunneling Construction on Adjacent Piles

摘要

The distribution regular of total additive load induced by bulkhead additive thrust, force of friction between shield and soil, and soil loss during shield tunneling construction was studied. The analytical results show that, the distribution regular of additive load is closely related with the relative position of pile and shield, and it is a three-dimensional problem. Toward the shield tunneling direction and perpendicular to the pipe wall, the additive load is changed from press to pull force along with the pass of shield excavation face. In addition, the value and influence bound of additive load in shield tunneling 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. It is proved by the comparison with the results of numerical simulation, centrifuge experiments and field measurement that the study on the influence due to shield tunnel excavation on neighboring piles is reliable through analytical analysis.