研究结论：大瑞铁路大保段地处印度板块与欧亚板块相碰撞缝合带附近。 区内地形地质条件极为复杂,活动断裂、地震灾害、崩塌、滑坡、泥石流及高温热水构成了控制线路方案的主要工程地质问题。 在充分总结汲取西南山区深切河谷与活动断裂带铁路地质选线经验的基础上, 提出了大保段地质选线定线技术原则,选取了地质条件具有优势的北线方案和霁虹桥桥位方案跨澜沧江。

Research conclusions：The Dali-Baoshan section of Dali-Ruili Railway is nearby the colliding suture zone o f the Indian plate with the Eurasian Plate. As the terrain and geological conditions in this area are extremely complicated, the railway track is much affected by the geological disasters, such as active fault, seismic hazards, collapse , landslides, debris flow and high-temperature hot water. Based on learning the experiences o f alignment in the southwest mountainous area with vale cut sharp and active fault, the technical principles of alignment in Dali-Baoshan section are presented, and the north route scheme with better geological conditions is selected with the railway crossing the Lancang River through the Jihongqiao Bridge.