基于地形地貌参数的山区铁路通道选线法

CHANNEL SELECTION METHOD FOR MOUNTAIN RAILWAY BASED ON TERRAIN AND GEOMORPHOLOGICAL PARAMETERS

地形地貌是地质选线的首要决定性因素。以川藏铁路金沙江流域为研究对象,采用地理信息系统技术,针对区域内各子流域的面积高程积分值、平均高程、起伏度、平均坡度和地形曲率进行了对比分析,选用熵权法对各子流域进行了地质选线适应性评价,以此确定线路宏观走向并选取理想通道。评价结果表明,选线分区与现场调查具有较好的一致性,基于地形地貌参数的通道选线模型可以应用于类似的山区铁路建设中,具有一定的理论意义和工程价值。

Topography is the primary determinant factor of geological route selection.This paper takes Jinsha River Basin of Sichuan-Tibet Railway as the research object.The hypsometric integral,average elevation,relief,average slope and terrain curvature of each sub-catchment are compared and analyzed using geographic information system technology.The entropy weight method is used to evaluate the adaptability of each sub-catchment to geological route selection.So the macro-trend of the line and select the ideal channel can be determined.The results show that the evaluation has a good consistency with field investigations.The channel selection model based on terrain and geomorphological parameters can be applied to similar railway constructions in mountainous areas and have certain theoretical significance and engineering value.