Research on the Mechanical Performance of Railway Bridge Pile Foundation After Adding Piles
Renovation of old bridges has been becoming more and more common in bridge engineering.When there is smaller movement between the new lines and the existing lines on the platform,moving the beams on the existing line to the new line is one of the most important tasks in the reconstruction and expansion projects of existing railway bridges in China.In order to meet the requirements of supporting the beam,the common construction methods is adding piles and widening piles.Adding pile causes the problem of interaction between old and new piles and soil so that it is necessary to study the mechanical properties of pile after adding pile.The mechanical performance of piles foundations was analyzed before and after pile adding through theoretical calculations and numerical simulations.The results show that,the bearing capacity of a single pile has decreased,which is about 90％of the one before adding pilesafter adding piles;After adding two pile foundations,the bearing capacity of the pile group has in-creased by about 20％;Under the same lateral load,the maximum bending moment of the side pile and the middle pile has reduced by13.23％and 12.50％respectively after adding pile;And the maximum lateral displacement of the side pile and the middle pile has reduced by 6.30％and 7.19％respectively.
railway bridgeadding piles in pile foundationstress performancetheoretical calculationnumerical simulation
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