陇东南某铁路越岭山区主要工程地质问题及地质选线

Main Engineering Geological Problems and Geological Route Selection in Mountainous Area of a Railway in Southeast Gansu

陇东南西秦岭山区地质条件复杂,断裂、褶皱等构造活动强烈,铁路建设面临滑坡、危岩落石、砾岩岩溶、活动断裂等众多工程地质问题,严重制约着铁路的走向。为指导铁路选线,在详细调绘的基础上,提出了越岭山区地质选线的原则。结合具体线路方案,通过分析实际工程地质条件,考虑工程设置及施工安全风险等因素,对三段越岭线路进行了比选,选定了从砾岩岩溶影响区侧缘通过、缩短穿越第三系红层线路长度、绕避滑坡群和高位危岩落石等受工程地质问题影响较小的方案。本文的研究成果对于西秦岭山区相似地质条件下的铁路选线具有借鉴意义。

The geological conditions in the West Qinling Mountains in Southeast Gansu are complex,and the tectonic activities such as faults and folds are strong.The railway construction is faced with many engineering geological problems such as landslide,dangerous rock falling,conglomerate karst,and active fault,which seriously restricts the trend of railway.To guide railway route selection,principles for geological route selection in mountainous areas have been proposed based on detailed investigation.Combined with the specific line scheme,through the analysis of the actual geological conditions,considering the engineering setting and construction safety risks and other factors,after comparing the routes of the three-section mountain-crossing,the schemes with less impacts from engineering geological problems,such as passing through the side of the conglomerate karst influence area,shortening the length of the route through the Tertiary red layer,and avoiding landslides and high dangerous rocks and falling rocks,were selected.The research results of this paper have reference significance for railway route selection under similar geological conditions in western Qinling Mountains.