Impact On The Viaduct Pile Foundation Analysis Of Shield Tunnel Construction

Shield construction of near viaduct will inevitably cause certain influence to theviaduct. It not only causes different degree of ground settlement and groundmovement near viaduct, but also produces certain effect on the viaduct pilefoundations. When it’s influence reaches a certain degree, it will affect the viaduct’ssafety and normal use. So it needs to analyze the viaduct pile foundation affected byshield construction.In this paper, using the method of theoretical analysis and numerical simulationthe research of shield construction impact on surface subsidence, the influencemechanism of viaduct pile foundation, the law which the viaduct pile foundation’sdeformation caused by shield construction, the scope of the viaduct pile foundationaffected by shield construction,such as get the following conclusion:1, The ground settlement caused by the shield construction, as the distance of thepile from the shield’s the center line increases, it will be decrease gradually. And theground settlement near pile foundation is much bigger than the settlement of the pilebody itself.2, The viaduct pile foundation affected by shield construction, it mainperformance on the axial force and displacement. Because we discussed end bearingtype piles in this article, it changes very little. So displacement is mainly manifestedin the pile on the horizontal and vertical displacement.3, The horizontal displacement of the pile is greater than the verticaldisplacement of the pile that caused by the shield construction. Because we arebased on end bearing type piles in this article. The shield construction has little effecton vertical displacement of pile body. The change of horizontal displacement on thetop of the pile is bigger caused by the shield construction, With the increase of pileembedded depth of pile horizontal displacement gradually become smaller, the lastchange on the pile end is zero.4, The longitudinal impact range of viaduct pile foundation is roughly shieldexcavation face of pile within8meter. Transverse impact range is roughly in thecenter line of the shield is apart from the pile within9meter. The influence scope isroughly1.5times the diameter of shield.