天平铁路越岭段主要工程地质问题及地质选线研究

Study on the Main Engineering Geological Problems and Geological Route Selection in the Cross Mountain Section of Tianshui-Pingliang Railway

滑坡、危岩落石是山区常见的地质灾害,具有活动频率高、突发性强、致灾严重的特点。天平铁路穿越六盘山及其余脉关山越岭段,地势起伏多变,沿线滑坡、危岩落石、岩堆广泛分布,地形、地质条件复杂,严重制约着线路方案的选择。在遥感判释、大面积调绘、适量钻探的基础上,通过认真分析研究区域构造、地质灾害发育分布特征,结合山区铁路综合地质选线原则,进行地质选线研究,对巨型滑坡群采取绕避的措施;对边界条件清楚、整治方案技术可行的中、小型滑坡、危岩落石,采取合理的工程措施,选取合适的线位通过,能够保证线路方案的经济合理,有关结论和建议可供同类工程项目参考。

The landslides and crag falling rocks are common geological hazards in mountainous areas,it has the characteristics of high activity frequency,strong suddenness and serious disaster.Tianshui-pingliang Railway runs through Liu-p’an Mountains and its remaining veins Guanshan cross-ridge section,the terrain is undulations and changeability,rock falling along the landslide and rock pile are widely distributed,and the complex terrain and geological conditions restrict the choice of route scheme seriously.The study suggests that:on the basis of remote sensing interpretation,large area annotation and proper drilling,through careful analysis and study of regional structure,development and distribution characteristics of geological hazards,and combining with the principle of comprehensive geological route selection for railway in mountainous areas,evasive measures should be taken for giant landslide groups,and for medium and small landslides and rockfalls with clear boundary conditions and technically feasible remediation plans,reasonable engineering measures should be taken and appropriate lines should be selected to pass.The study of geological line selection can ensure the route scheme is economic and reasonable.The conclusions and recommendations can be used as reference for similar projects.