新建公路桥梁上跨既有电气化铁路路基段设计研究

Research on the Design of New Highway Bridges Crossing Existing Electrified Railway Subgrade Sections

新建公路桥梁上跨既有电气化铁路,施工及运营期间会对既有电气化铁路的运营安全产生一定影响,因此需要在设计阶段即考虑施工及运营期间可能产生的危及铁路运营安全的问题,提前在设计阶段予以防控解决。以某新建高速公路桥梁上跨沪昆铁路路基段为研究对象,分析施工及运营期间可能产生的安全问题,并提出解决措施,确保铁路运营安全。同时采用有限元软件对桥梁桩基、铁路路基进行模拟,分析了新建工程影响下的铁路路基位移,结果表明,桩基施工、基坑开挖及成桥运营引起的路基位移非常微小,对既有铁路基本没有影响。

The construction and operation of a new highway bridge crossing an existing electrified railway will have a certain impact on the operational safety of the existing electrified railway.Therefore,it is necessary to consider potential issues that may endanger railway operation safety during the construction and operation stages in the design phase,and to prevent and control them in advance during the design phase.Taking the roadbed section of a newly-built highway bridge spanning the Shanghai Kunming Railway as the research object,this paper analyzes the potential safety issues that may arise during construction and operation,and proposes solutions to ensure railway operation safety.At the same time,finite element software was used to simulate bridge pile foundations and railway embankments,and the displacement of railway embankments under the influence of new construction projects was analyzed.The results showed that the displacement of embankments caused by pile foundation construction,foundation pit excavation,and bridge operation was very small,and had little impact on existing railways.