摘要
新建道路跨越铁路位置的选择对投资项目的前期方案决策有着至关重要的作用。依托安康市城区长春路跨越襄渝(襄阳—重庆)铁路工程,对铁路路基及隧道受新建上跨道路的影响进行定性分析,采用大型三维有限元软件MIDAS/GTS对影响程度进行定量计算分析。结果表明:跨越铁路路基的桥梁主墩基坑施工会影响轨道的几何平顺性,应在铁路安全保护区外施工,基坑深度不宜超过基坑与铁路的水平距离;跨越铁路隧道的桥梁,在桩基布设于1倍隧道洞径以外时,应控制隧道上方的挖方深度不超过原覆土深度的58%。
The location selection of the new road crossing the railway plays a vital role in the early scheme decision-making of the investment project.Based on the project of Changchun Road crossing Xiangyang-Chongqing railway project in Ankang City,the influence of new municipel bridge on the railway subgrade and tunnel was qualitatively analyzed,and the influence degree was quantitatively calculated by using the large-scale three-dimensional finite element software MIDAS/GTS.The results show that the construction of the foundation pit of the bridge main pier crossing the railway subgrade will affect the geometric smoothness of the track.It should be constructed outside the railway safety protection area,and the depth of the foundation pit should not exceed the horizontal distance between the foundation pit and the railway.For bridges crossing railway tunnels,when the pile foundation is arranged beyond one time the tunnel diameter,the excavation depth above the tunnel shall not exceed 58%of the original overburden depth.
作者
卢裕杰
LU Yujie(China Railway Fifth Survey and Design Institute Group Co.Ltd.,Beijing 102600,China)
出处
《铁道建筑》
北大核心
2021年第10期87-90,共4页
Railway Engineering
基金
中铁第五勘察设计院集团有限公司科技研究开发计划(T5Y2021-C17)。
关键词
市政桥梁
铁路隧道
铁路路基
数值模拟
上跨铁路施工
影响程度
对比分析
municipal bridge
railway tunnel
railway subgrade
numerical simulation
overpassing railway construction
influence degree
comparative analysis
