盾构隧道侧穿既有桥梁桩基的相互影响研究

Study on interaction of shield tunnel side crossing existing bridge pile foundation

为探究盾构隧道侧穿既有桥梁时对桥梁桩基的影响规律,采用三维数值仿真分析的方法对某地铁区间下穿高架桥梁桩基的实例进行建模分析,并用现场监测数据来验证计算的准确性。研究结果表明:数值分析计算与现场实际相差较小,且桩基变形绝对值较小;盾构隧道侧穿既有桥梁桩基的工况下可不对桥梁桩基进行预加固处理,但应做好专项监测方案,并做好现场应急预案,以确保隧道顺利贯通且保证桥梁结构的安全性和使用功能完整性。研究结果可为同类工程设计和施工提供有益参考。

In order to explore the influence of shield tunnel side crossing existing bridge on the bridge pile foundation,the three-dimensional numerical simulation analysis method was used to model and analyze the example of a subway section crossing the viaduct pile foundation,and the field monitoring data was used to verify the accuracy of calculation.The results show that the difference between the numerical analysis and the actual field is small,and the absolute value of pile foundation deformation is small.Under the condition of shield tunnel side crossing the existing bridge pile foundation,the pre-reinforcement treatment of bridge pile foundation is not necessary to be carried out,but the special monitoring scheme and the on-site emergency plan should be made,so as to guarantee the smooth passage of the tunnel and ensure the safety and functional integrity of the bridge structure.The research results can provide useful reference for the design and construction of similar projects.