介绍了某铁路线既有铁路和新建双线的工程概况,展示其平面位置和线路走向,并描述了既有隧道存在的一些病害问题。从工程地质情况、运输能力、技术经济指标以及后期维护情况,对新建双线是否保留既有线两种方案进行了比选,得出了最合理可行的选线方式。 This paper introduces the project overview of existing railways and new double lines in a railway line, shows the plane position and line direction, and describes some existing disease problems of the existing tunnels. From the engineering geological conditions, transport capacity, technical and economic indicators and the maintenance of the situation, the new two-lane whether to retain the existing two options were compared, obtained the most reasonable and feasible route selection.