CONSTRUCTION TECHNOLOGY FOR BOX GIRDERS ON SOFT FOUNDATIONS IN SMALL RADIUS CURVES FOR HIGH-SPEED RAILWAYS
To prevent safety accidents caused by excessive deformation during bridge construction and service,this study focuses on the construction technology for small-radius curve continuous beams in soft soil areas.Using the C-ramp bridge project of the Fuli Expressway and Dazong Lake Interchange as a case study,a soft soil reinforce-ment plan was proposed based on the site's geological conditions.A finite element model of the curved continuous beam was established to simulate the deformation of the bridge under self-weight and prestress.The results indicate that pre-construction treatment of the soft soil using methods such as"excavating soft soil,replacing with brick bal-last,and vibration compaction"ensures the stability of the cast-in-place supports.Under the self-weight,the maxi-mum vertical displacement of the bridge after soft soil treatment was only-10.5 mm,which is 0.51 times of the dis-placement before treatment.The maximum vertical and radial displacements occurred at the mid-span of the edge spans and the middle of the beam,respectively.To better control bridge construction quality,deformation monitoring was conducted,with the maximum deviation in the formwork elevation being 6.5 mm.The bridge deformation re-mained within the control range,and the simulated values closely matched the monitored values.The findings of this study provide valuable reference for practical construction.
small radius curved box girdercast-in-place bracket methodcurved continuous girder
万方数据
维普
