Research On The Effects Of Shield Tunnel Crossing Overpass Pile Group Construction

The excavation of city subway tunnel will inevitably cause the surrounding soil’s disturbance, Thereby affecting the underlying of buildings or structures nearby. Research on the adjacent building subway shield tunnel construction, the influence of content has important practical significance. Provide a reference value for the subsequent Hefei Metro Line construction and domestic similar areas of Metro Shield Tunnel ConstructionThis paper takes Hefei subway shield tunneling construction engineering as background,according to practical geological exploration data,with finite software MIDAS GTS numberical analysis.Research on the shield tunnel crossing near pile deformation and the inclined,discusses the change of soil’s c and Φ values and the pile distance from tunnel tunnel axis of individual factors on the pile group shielding effect,discussion shield tunneling under different circumstances on the superstructure wear overpass.The article main work includes:(1) Describes the principle of shield tunnel construction,the Surface subsidence mechanism and pile deformation mechanism and MIDAS GTS is implemented in simulation of shield tunnel construction;(2) With the finite software MIDAS GTS,establishing three-dimensional model of shield tunneling ang pile.Based on Hefei soil parameters,considering the deformation of same position different length of the pile and different position same length of the pile and the incline of the pile,with the process of the shield tunneling.(3) Based on the shield tunneling of Hefei subway Line 1 traversing viaduct pile,by considering the piles, soil and tunnels as a whole,discusses the change of soil’s c and Φ values and the pile distance from tunnel tunnel axis of individual factors on the pile group shielding effect.(4) On the basis of the previous model, it is to be further researched on the different possition when the shield tunneling under the overpass,discuss the longitudinal deformation of the bridge pier and the internal force and deformation of the overpass bridge deck.The research results is expected to accurately predict the effects to the adjacent group piles foundation is hopefully to provide essential theoretical supports for the design and construction of rail transit.