高铁桥梁并行扩建高速公路设计研究

Research on Design of High-speed Railway Bridge in Parallel with Expansion of Expressway

高速铁路桥梁与高速公路并行建设可以形成综合交通走廊,节约通道资源。介绍了连云港至镇江高铁长距离并行京沪高速公路情况,对匝道上跨方案、匝道外跨方案进行对比,研究了匝道扩建实施方案。结合铁路、公路设计情况,地质条件等因素,建立了公铁并行间距10 m~120 m的有限元模型,得到不同间距情况下,高速公路扩建对高铁桥梁竖向及横桥向的位移影响数值,结果表明:扩建高速公路匝道宜与新建高铁桥梁同步建设,铁路上跨匝道可以减少工程征地拆迁,符合地方经济发展需求;高铁与扩建高速公路并行间距控制在30 m以上可以有效控制扩建高速公路对高铁桥梁的变形影响。

The parallel construction of high-speed railway bridges and expressways can form a comprehensive transportation corridor and save channel resources.In this paper,the Lianyungang to Zhenjiang High-speed Railway that in long distance parallel with the Beijing to Shanghai Expressway is introduced,the on-ramp span scheme and off-ramp span scheme is compared,and the ramp expansion implementation scheme is studied.Combined with the design of railway and highway,geological conditions and other factors,a finite element model of the parallel distance between highway and railway of 10m~120m is established,and the influence of expressway expansion on the vertical and transverse displacement of high-speed railway bridge at different distances is obtained.The results show that:the expansion of expressway ramp should be built synchronously with the construction of new high-speed railway bridge.The on-ramp across railway can reduce the construction of land acquisition and demolition,and meet the needs of local economic development.If the parallel distance between high-speed railway and expanded expressway is more than 30m,the influence of expansion of expressway on high-speed railway bridge deformation can be effectively controlled.