Analysis of the Impact of Bridge Pile Foundation Construction on Adjacent Existing Tunnels
In order to analyze the impact of bridge construction on adjacent tunnels,taking the con-struction of a bridge adjacent to an existing tunnel as the engineering background,midas GTS NX fi-nite element software is used to analyze the impact of bridge construction on the tunnel structure.The displacement and internal force results of the tunnel lining structure are obtained.The analysis results indicate that during the drilling and excavation process of the bridge pile foundation,due to the hollo-wing out of the soil in the pile hole,the stress in the surrounding rock is released,resulting in hori-zontal displacement of 1.1 mm and 3.56 mm in the left and right holes of the rail transit tunnel.After the stress release during bridge excavation,the vertical displacement decreases under the action of the overlying load,showing a trend of first increasing and then decreasing.The final vertical displacement is 0.95 mm and 2.56 mm.During bridge construction,the maximum tensile stress of the tunnel lining structure is 916 kPa.The maximum compressive stress value is 3 133 kPa and the maximum bending moment is 74 kN·m,both of which meet the strength requirements and ensure the normal operation of the rail transit tunnel.
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