Analysis Of Internal Force And Deformation During Construction Of Cross Interchange Transition Station

With the development of urban rail transit network in Shanghai, the construction of interchange connections will be a new technical problem for building the whole rail transit network. In order to provide the technical support for the safe construction, numerical analysis was used to simulate the whole construction.Some transition types, such as the parallel transition station, the "T-shaped" interchange connection, the "L-shaped" interchange connection, the cross interchange connection and the tunnel interchange connection were compared on construction technology and service performance with the method of researching and listing, the cross interchange connection is the most popular style in our country at present.With designing theories of deep foundation, the Finite Element Method and ANSYS software, twenty mainly construction cases were calculated. The following conclusions were drew:(1) The terminal deformation and internal forces of asymmetric chiseling-off of diaphram are the same to those of the symmetric chiselling-off. But the deformation and internal forces of the former during the construction are more dangerous than the later one.(2)The asymmetric excavation and the asymmetrically chiseling-off of the diaphgram are the relativly most dangerous constructions cases.(3)The main influence range is in the interchange stage during the interchange connection construction.(4)The lateral movement of diaphgram was 2.5mm because of asymmetric construction. The beam, plane and pole are influenced prominently. The computation outcome is as follows: The maximum vertical displacement is 17mm, the beam internal force is enlarged 1.5-2.5 times and the pole internal force is enlarged 2-4 times.(5)The change of stress pattern and the force path were the main reason of the structure deformation and internal forces alteration.According to the above analysis, the deformation of the diaphgram and ground...