盾构隧道下穿高速铁路桥梁施工影响数值分析

Numerical Analysis on Impact of Shield Tunnel Under-crossing High-speed Rail Bridge

地铁盾构下穿既有高速铁路施工是一項高风险作业,加固方案的合理性直接影响到隧道施工安全和高速铁路运营安全。本文建立结构-高铁桥墩基础-土体有限元模型,分析盾构施工过程中高铁桥墩的变形特征,评估工程安全性;地铁隧道周边采用加固措施后,能够降低左右线隧道掘进相互之间的影响。分析结果表明变形满足高铁桥梁变形相关规定,不影响高铁运营安全,该结论对类似工程有一定借鉴意义。

The construction of subway shield under passing the railway is a high risk job, the rationality of reinforcement scheme directly affects the safety of tunnel construction and the operation of high-speed railway. In the paper, the finite element mode about the interaction among shield construction, high-speed railway pier and soil was established to analyze the deformation features of the high-speed railway pier, and evaluate the safety of engineering. The reinforcement measures for surrounding tunnel could reduce the impact of left and right line tunneling between each other. The results show that the deformations of the pier meet the requirements of high-speed railway bridge without affecting the operation safety of highspeed railway. The conclusions have some reference significance for similar projects.