摘要
本文依托北京地铁新机场线下穿京沪铁路特大桥工程,建立计算模型,分析了施工过程对既有铁路桥梁结构的影响及隧道结构自身的安全性、稳定性。研究结果表明:(1)采取防护措施后,隧道施工引起桥梁墩柱的竖向位移、差异沉降、水平位移最大值等变形值均在相关规范允许范围内;(2)通过采取管幕及中隔壁等有效防护措施,隧道初支结构的轴力、弯矩极值有所减小,提高了安全系数,能达到当地安全控制标准。研究成果可为地铁下穿既有运营铁路桥梁的隧道施工及防护方案提供一定的参考借鉴。
This paper takes Beijing Metro new^ airport line underneath passing Beijing-Shanghai railway bridge as an example , calculation model is built , the influence of construction on existing railway bridge structures and the safety and stability of tunnel structures are analyzed. The results show that the vertical displacement, differential settlement and maximum horizontal displacement caused by tunnel construction are all within the allowable range of relevant codes. By taking effective protective measures such as pipe curtain and median lamella , the extremum of axial force and bending moment of the initial support structure of the tunnel has been reduced , the safety factor has been improved , and the local safety control standard can be reached. The research results provide some references for the tunnel construction and protection schemes of Metro underneath passing the existing operating railway bridges.
作者
武俊杰
WU Junjie(6th Engineering Co. , Ltd. , China Railway 23rd Bureau Group, Chongqing 400012, China)
出处
《高速铁路技术》
2019年第1期91-96,共6页
High Speed Railway Technology
基金
国家自然科学基金(51478277)
关键词
隧道
高速铁路
特大桥
下穿施工
近接桩基
防护措施
tunnel
high-speed railway
grand bridge
underneath passing construction
close-spaced pile foundation
safeguard measure
