盾构隧道下穿既有运营铁路影响性分析及控制技术研究
Study on Impact Analysis and Control Technology of Shield Tunnels Undercrossing Existing Operating Railways
璩泽君 1江胜华 1王田龙2
作者信息
- 1. 中铁四局集团有限公司,安徽 合肥 230022
- 2. 贵州大学 管理学院,贵州 贵阳 550025
- 折叠
摘要
盾构隧道下穿施工对既有运营铁路的影响较大.依托徐州某涉铁工程实例,采用Midas GTS NX软件建立有限元模型,研究了隧道下穿过程中铁路变形的动态变化过程,分析了铁路钢轨的高低和水平不平顺情况.结果表明:盾构隧道穿越过程中铁路路基沉降值逐渐增大,最后趋于稳定;隧道施工引起的铁路路基沉降分布曲线可近似为正态分布,且下穿位置正上方路基沉降值最大;铁路钢轨的高低和水平不平顺最大值满足规范要求.盾构隧道下穿京沪铁路设计方案可行,为进一步保证下穿施工的安全提出了涉铁施工一系列保护措施,为类似工程提供参考.
Abstract
The shield tunneling construction has great influence on existing operating railways.This paper has studied the dynamic changes of railway deformation during tunneling,and analyzed vertical and horizontal unevenness of railway tracks by relying on a case study of a railway-related project in Xuzhou and employing Midas GTS NX software to establish a three-dimensional finite element calculation model.The results show that:in the process of shield tunneling,the settlement value of the railway roadbed gradually increases,and eventually becomes stabilized.The distribution curve of railway roadbed settlement caused by tunnel construction can be approximated as a normal distribution,with the roadbed settlement value directly above the tunneling position being the maximum.The maximum values of vertical and horizontal unevenness of the railway tracks meet the regulatory requirements.In addition,it also demonstrates the feasibility of the design scheme for tunneling underneath the Beijing-Shanghai railway.To further ensure the safety of tunneling construction,a series of protective measures for railway-related construction are proposed to provide reference for similar projects.
关键词
盾构隧道/下穿施工/铁路路基/铁路桥梁/有限元分析Key words
shield tunnel/tunneling construction/railway roadbed/railway bridge/finite element analysis引用本文复制引用
基金项目
中国中铁股份有限公司科技研究开发计划资助(2023-专项-10)
出版年
2024
NETL
NSTL
万方数据