Research On The Track Deformation And Dynamic Characteristics Under The Conditions Of Electric Shield Tunnel Undercrossing The Existing Metro Tunnel

ABSTRACT:With the fast development and construction of the urban rail transit, the subway in big cities has shown the trend of gridding gradually. Some of the newly constructed metro lines will cross the municipal pipelines and existing lines inevitably. Thus the deformation of the existing lines and track structures will influence the normal operation when these newly built tunnels traverse under the existing lines. So it is of important reference significance to carry out systematic research of the deformation law of the existing lines and the dynamic response of track structure due to the undercrossing engineering.Based on widely literature review, this thesis takes a certain electric power shiel tunnel undercrossing the subway structure of compound lining section. Started from system point of view, the dynamic characteristic of the system is studied, considering the interaction of the vehicle, the track and structure. The following subjects are mainly discussed in the thesis:1. According to the situation and method of present research of the crossing engineering home and abroad, the research content and the study method is proposed with the issues of urban rail transit frequently crossing with the municipal pipelines.2. Relying on the practical engineering, the monitoring data of the engineering is sorted and analyzed. Then the deformation law of the track structure is concluded when the tunnel undercrossing the subway structure of compound lining.3. With the finite element software ABAQUS, a vehicle-track-structure dynamic coupling model is established. The crossing process is then divided into six typical stage according to the relative position. With the field test data, the dynamic characteristic of the vehicle and track structure is studies of the every construction stage.4. By expanding the scale factor of the final deformation of the metro track structure after the tunnel is constructed, the dynamic characteristic of the vehicle and track structure is predicted with the different scale factor.