新建市域铁路填方路基下穿高速铁路桥梁施工影响研究  

Study on the Construction Influence of New Urban Railway Fill Subgrade Underpassing High-speed Railway Bridges

作　　者：孙良鑫[1] SUN Liangxin(China Railway First Survey and Design Institute Group Co.,Ltd.,Xi'an 710043)

机构地区：[1]中铁第一勘察设计院集团有限公司,西安710043

出　　处：《路基工程》2025年第2期156-160,共5页Subgrade Engineering

摘　　要：以郑许市域铁路某下穿京广高铁工程为依托,进行铁路路基下穿既有高铁桥梁的影响研究。结果表明:填方路基采用U型槽+桩基方式,可有效控制附加荷载对既有高铁桥梁的影响;采取隔离桩、保证桩间距等措施后,新建工程桩施工对既有桩的影响可得到有效控制;采取可靠措施后,下穿永久荷载的作用下既有桥墩的横向位移远小于竖向位移,说明下穿工程的附加荷载对既有桥梁的横向位移影响较小,对竖向位移影响较大。Based on a project of Zhengzhou—Xuchang Urban Railway underpassing Beijing—Guangzhou high-speed railway,this paper studied the influence of railway subgrade underpassing existing high-speed railway bridges.The result shows that,the construction method of U-shaped groove+pile foundation can effectively control the impact of additional load on the existing high-speed railway bridge.After taking measures such as isolating piles and ensuring pile spacing,the influence of new engineering pile construction on existing piles can be effectively controlled.After taking reliable measures,the lateral displacement of the existing bridge pier under the action of the permanent load is much smaller than the vertical displacement,indicating that the additional load of the underpassing project has a little influence on the lateral displacement of the existing bridge,and has a great influence on the vertical displacement.

关 键 词：营业线 路基下穿施工 既有桩基 群桩效应 变形控制 安全性 

分 类 号：U231.3[交通运输工程—道路与铁道工程]