为使铁路线路初始平面更经济合理并满足设计规范,提出了基于栅格数据最优路径分析及知识推理生成线路初始平面的自动生成方法.通过采用16单元的骑士邻域模式,在桥梁和隧道施工费用中考虑线路坡度的.影响,以及在与线路长度相关的施工费用中考虑速度目标值,改进了Dijkstra算法.利用改进的Dijkstra算法在多个指定控制点之间生成最优路径.通过二分渐进和平面曲线自动配置,将矢量化的最优路径转换为满足设计规范的初始平面.在基于GIS的铁路选线系统智能环境中的应用表明,采用本文方法能生成令人满意的初始方案,与常规方法相比,对局部方案可节约90%以上的线路平面设计时间.%In order to make the initial horizontal alignment of railway line more practical and meet the design code, a method for automatic generation of railway horizontal alignment was proposed based on knowledge reasoning and optimal route analysis in raster data format. First, the Dijkstra algorithm was improved by using Knight's neighboring pattern of 16 cells and taking account, in a construction cost model, of the influence of design slope on the bridge and tunnel construction costs and target speed of railway line on its length concerning cost. Then, the improved Dijkstra algorithm was used to propose an optimal route among the existing control points. Finally, by gradual dichotomy and automatic configuration of the horizontal curve, the vectorized optimal route was converted to an initial horizontal alignment that meets the design code. An actual application in a GIS-based railway location intelligent environment manifested that the proposed method can generate a satisfactory initial railway horizontal alignment. Compared with the conventional method, the proposed method can save more than 90％ time in the design of local railway horizontal alignment.
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