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奉科金沙江大桥是丽江至泸沽湖旅游环线的控制性工程,也是阿海水电站水库淹没复建工程。项目区金沙江河段处于地质灾害群发区,岸坡稳定性差,不良地质作用强烈,工程地质条件复杂,水库蓄水后可能引发古滑坡复活或大规模塌岸,跨江桥位选择极其关键。结合桥位比选原则和限制条件,对项目区金沙江河段进行重点研究,通过跨江桥位多方案比选,确定推荐桥位。实践证明该推荐桥位是安全可靠的,可为类似工程地质条件区桥位选择提供参考。
Bongke Jinsha River Bridge is the control loop between Lijiang and Lugu Lake control project, but also Ahai hydropower reservoir inundation reconstruction project. The Jinsha River reaches the geohazard-prone area in the project area with poor stability of the bank slope, strong adverse geological effects and complex engineering geological conditions. After the reservoir is impounding, the ancient landslide may trigger resurgence or large-scale bank collapse. Cross-river bridge positioning is crucial. Combined with the principles of comparison and selection of bridge positions and the restriction conditions, the Jinsha River in the project area is mainly studied, and the recommended bridge positions are determined through the comparison and selection of multi-scheme of cross-river bridges. Practice has proved that the proposed bridge position is safe and reliable, which can provide reference for the selection of bridge positions in similar engineering geological conditions.