架空结构在新建高铁引入既有高铁车站的应用

随着高速铁路网的建设,很多既有高铁站需要引入新线,新线建设不可避免对既有敏感的无砟轨道系统产生影响,管控新建路基变形并保证既有高铁运营安全是一个重大课题。在总结已有工程经验的基础上,分析设计的重点和难点,结合工程实践,提出一种新的路基结构形式即架空结构,利用有限元软件对普通填料、轻质填料和3种架空结构对既有高铁的影响进行模拟分析计算,并开展造价分析对比,进一步优化结构设置方式,降低了工程投资。对比分析结果表明:架空结构具有自重小,施工便捷,干扰小等优点,下部空间具有商业开发价值的特点,在填料缺乏、地基软弱地区具有显著优势,可以推广使用。

The Application of Hollow Structure in the Introduction of Newly-built High-speed Railway Into Existing Stations

With the construction of high-speed railway network,many existing high-speed rail stations are in need of introducing new railway lines. The construction of new lines will inevitably affect the existing sensitive ballastless track system. How to control the deformation of new line subgrade and meanwhile ensure the safety of existing high-speed rail operations has become a major issue. On the basis of the existing engineering experiences,this article analyses the focal and difficult points in design. A new form of roadbed structure( hollow structure) is proposed according to the engineering innovation and practice.Computer simulation analysis is carried out to measure the influences of normal fillers,light fillers and three hollow structures on the existing high-speed railways with Finite Element Method. By means of cost analysis and comparison,the article makes use of the merits of the hollow structure to further improve the structure arrangement and reduce project investment cost. The comparative analysis results indicate that the hollow structure can be widely used in filler-lacking soft soil foundation due to its dominant advantages of light weight,convenient construction,small disturbance and potential commercial development in lower space.