近年来随着我国山区铁路的大量修建，山区铁路地质选线的重要性日益凸显。阳安铁路是典型的山区铁路增建第二线项目，该项目进行地质选线对于降低后期勘察设计难度、减少投资、降低后期维护费用等方面起决定性作用。针对既有河谷线地段，增建第二线线路穿越区域性大断裂等工程地质问题，采取何种地质选线的技术原则进行研究。研究结论：(1)本次地质选线过程中，综合采用遥感解译、地质调绘、钻探、试验等勘探方法，查清沿线的工程地质条件；(2)对线位比选起决定性作用的工程地质条件主要是断层、滑坡等不良地质，线路通过断层应以大角度、简单工程通过，其余不良地质应以绕避为主；(3)在充分总结汲取山区铁路综合选线技术经验的基础上，提出地质选线、定线原则；(4)通过对阳平关至响水、西乡至石泉、石泉至池河三段线路方案的比选，得出推荐方案。%With the construction of a large number of mountain railways in our country, research on geological route selection becomes more important. Yang-An railway, passing the Micang mountain and Daba mountain is a typical railway in mountain area. Geological route selection plays a key role in reducing post-survey and design difficulties, cutting down investment and lowering ongoing maintenance costs. This paper is aimed at the principle of route selection with respect to the second line passing river valley and regional faults. Research conclusions:(1) In the process of geological route selection, remote sensing, geological mapping and drilling are employed to identify engineering geological conditions along the line. (2) The main decisive factors of engineering geological conditions in route selecting are regional faults, landslide and other unfavorable geological areas. The railway line shall pass faults at a big angle with simple engineering, and other unfavorable geological areas shall be bypassed. ( 3 ) Based on the experiences accumulated in route selection in mountain area, the principle for geological route selection and alignment is proposed. ( 4 ) With comparison of the route selection schemes for Yangpingguan-Xiangshui, Xixiang-Shiquan and Shiquan-Chihe railway lines, route selection scheme for Yang-An railway is obtained.
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