汉宜客运专线铁路某路桥过渡段形式的有限元分析

FEA on the Form of Transition Zone between Bridge and Embankment in Hanyi Railway Project

路桥过渡段处容易产生差异沉降问题,对该问题解决的好坏直接关系到铁路的正常运行和安全.文章在分析路桥差异沉降的危害和主要原因的基础上,归纳总结了路桥过渡段处治要求,并对搭板与土工格栅处治形式的工作机理进行了定性分析;以汉宜铁路客运专线天门段某路桥过渡段为例,建立了精细的有限元模型,运用非线性有限单元方法分析了搭板与土工格栅联合处治形式的工作性态,以及在实际工程中的效果,并提出了相应的设计参数,为制定汉宜铁路客运专线路桥过渡段形式提供了参考依据.

The differential settlement is a common issue occurring in the transition zone between bridg- es and embankments, which influences on the normal and safety operation of the railway. Based on the a nalysis of the harmfulness and the causes of the differential settlement between bridges and embankments, the improved requirements of the transition zone are summarized and the working mechanism of plate and geogrid is discussed qualitatively. A typical transition zone of Hanyi Railway Project in Tianmen is taken as an example. The relevant finite element model is established carefully, the working behavior of the transition zone treated by the combination of plate and geogrid is studied thoroughly using non-linear finite element method, the treatment effect is evaluated and the design parameter is also presented which can be taken as the reference in the practice.